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Crack quantitative aptitude with structured lessons, practice and mock tests

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Profit & Loss 3 / 5

A shopkeeper marks an item up by 25% and then gives a 20% discount. What is his profit percentage?

  • A No profit, no loss
  • B 5% profit
  • C 10% profit
  • D 25% profit

1.25 × 0.80 = 1.00 so the selling price equals the cost price.

Hint 1 of 3
Full solution
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Everything you need to get exam-ready

Learn the idea, practise it, test yourself, then fix what is holding you back, all in one place.

Learn and practise

Lessons that teach the idea, then practice with full solutions

69 short lessons across 16 topics. Each one explains the concept with worked examples, then opens practice at easy, medium and hard levels. Every question comes with three hints and a step-by-step solution.

  • Short lessons with worked examples and common mistakes
  • Three hints and a full solution on every question
  • Build your own practice by topic and difficulty

Percentages · Lesson 1

Introduction to Percentages

8 min read

  • Convert between percentages, fractions and decimals
  • Find a percentage of any amount
  • Avoid the common mistakes
Easy Medium Hard
Practice after every lesson
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Test

Timed mock tests that feel like the real paper

Sit a full paper against the clock, mark questions for review, and get your score the moment you submit. More mock tests are added as new topics are completed.

  • A countdown timer and a question palette
  • Your score straight away
  • Review every question with its solution
Aptitude Mock Test 24:18

Question 7 of 20

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Answered For review Not answered
Timed paper
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Improve

Analytics that find your weak spots

See which topics and skills cost you marks and how your accuracy is trending, so you spend your time where it counts.

  • Accuracy by topic and by skill
  • Trends over 7, 30 and 90 days
  • See where you are slower than other learners
Your analytics OverviewTopicsTrend
  • Percentages84%
  • Averages71%
  • Ratios63%
  • Time & Work46%
Weak topic spotted
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Stay consistent

A daily workout and an error notebook

A short set every day, drawn from the topics you have started. Questions you get wrong are saved and come back on a schedule, so a mistake today does not cost you marks in the exam.

  • Recent questions, older ones, a weak spot and a challenge
  • Mistakes return for review on a schedule
  • A streak to keep you coming back
Today's workout 7-day streak
  • RecentProfit & Loss
  • OlderAverages
  • Weak spotTime & Work
  • ChallengeNumber System
Error notebook3 mistakes are due for review today
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How it works

  1. Learn

    Pick a topic and work through short lessons with worked examples.

  2. Practise

    Answer questions at easy, medium and hard levels, with hints when you are stuck.

  3. Test

    Take timed mock tests to build speed and see where you stand.

  4. Improve

    Use analytics, the daily workout and the error notebook to fix what is holding you back.

The full syllabus: 16 topics, 69 lessons

Every topic below is included with JustQuant Premium. Open a topic to see its lessons.

You were looking for Percentages. It is part of JustQuant Premium, and its lessons are listed below.

Percentages

5 lessons · 147 practice questions

Master the language of parts and wholes — from basic conversions to successive changes and real-world applications.

  1. Introduction to Percentages 8 min read
  2. Percentage Calculations 10 min read
  3. Percentage Change 12 min read
  4. Reverse Percentages 10 min read
  5. Applications: Discounts, Tax, and Commission 12 min read

Profit & Loss

5 lessons · 140 practice questions

Master the mechanics of buying and selling — from basic profit and loss calculations to discounts, marked price, successive transactions, and faulty weights.

  1. Cost Price, Selling Price & Basic Profit and Loss 10 min read
  2. Percentage Profit and Loss 12 min read
  3. Discounts and Marked Price 12 min read
  4. Successive Transactions 12 min read
  5. Faulty Weights and Advanced Problems 14 min read

Ratio & Proportion

5 lessons · 150 practice questions

Master the language of comparison — from simplifying ratios and solving proportions to dividing quantities, compound ratios, and exam-level word problems.

  1. Understanding Ratios 8 min read
  2. Proportion & Variation 10 min read
  3. Dividing in a Ratio 10 min read
  4. Continued Ratio & Compound Ratio 12 min read
  5. Ratio Word Problems 14 min read

Time & Work

4 lessons · 118 practice questions

Master work-rate reasoning — from a single worker's daily output to combined teams, wage-sharing, and pipes filling or draining a tank.

  1. Work Rate Basics 7 min read
  2. Combined Work & Efficiency 10 min read
  3. Work & Wages 8 min read
  4. Pipes & Cisterns 9 min read

Time, Speed & Distance

5 lessons · 150 practice questions

Master speed, distance, and time relationships — from basic calculations to relative speed, trains, and boats & streams.

  1. Speed, Distance & Time Basics 7 min read
  2. Average Speed 8 min read
  3. Relative Speed 8 min read
  4. Trains 8 min read
  5. Boats & Streams 8 min read

Simple & Compound Interest

4 lessons · 146 practice questions

Master simple and compound interest calculations, including different compounding frequencies and how to compare SI and CI outcomes.

  1. Simple Interest 7 min read
  2. Compound Interest 9 min read
  3. Compound Interest with Different Compounding Frequencies 9 min read
  4. Comparing Simple and Compound Interest & Effective Rate 9 min read

Averages

4 lessons · 150 practice questions

Master the mean, weighted mean, and how averages shift when values change or groups combine.

  1. Basic Averages 7 min read
  2. Weighted Averages 9 min read
  3. Average Change Problems 8 min read
  4. Combined & Exam-Style Averages 10 min read

Mixtures & Alligation

4 lessons · 152 practice questions

Blend the alligation shortcut with ratio and average reasoning to solve mixture, replacement, and dilution problems fast.

  1. Introduction to Mixtures 8 min read
  2. The Alligation Method 9 min read
  3. Replacement Problems 9 min read
  4. Mixture of Mixtures & Advanced Problems 10 min read

Pipes & Cisterns

3 lessons · 126 practice questions

Extend work-rate reasoning to filling and emptying pipes, leaks, and multi-pipe cisterns with alternate or staggered opening.

  1. Filling & Emptying Pipes Basics 8 min read
  2. Pipes with Leaks & Combined Rates 9 min read
  3. Advanced Cisterns (Multiple Pipes, Alternate Opening) 10 min read

Boats & Streams

3 lessons · 144 practice questions

Extend speed, time, and distance reasoning to motion in a current — downstream, upstream, and round-trip problems.

  1. Downstream & Upstream Basics 7 min read
  2. Finding Boat & Stream Speed 9 min read
  3. Advanced Boats & Streams (Round Trips, Time Comparisons) 10 min read

Partnership

3 lessons · 144 practice questions

Share profits and losses fairly among business partners — from equal-time capital ratios to time-weighted and working-partner arrangements.

  1. Simple Partnership (Equal Time) 7 min read
  2. Partnership with Time Periods 8 min read
  3. Advanced Partnership (Working Partners, Compound Changes) 10 min read

Number System

5 lessons · 280 practice questions

Master divisibility rules, factors, LCM/HCF, remainders, and unit-digit cyclicity for fast, accurate quantitative aptitude problem solving.

  1. Divisibility Rules 9 min read
  2. Factors, Multiples, LCM & HCF 11 min read
  3. Remainders & Modular Arithmetic 10 min read
  4. Unit Digit & Cyclicity 10 min read
  5. Number System Applications (Advanced) 11 min read

Data Interpretation — Tables

4 lessons · 200 practice questions

Read, analyse, and calculate from tabular data — percentages of totals, ratio comparisons, missing values, and multi-table cross-referencing.

  1. Reading & Interpreting Tables 6 min read
  2. Percentage & Ratio Based Table DI 7 min read
  3. Missing Value & Derived Data Tables 7 min read
  4. Advanced Multi-Table DI Sets 8 min read

Data Interpretation - Charts

4 lessons · 220 practice questions

Read and interpret bar graphs, pie charts, line graphs, and combination chart sets - represented as data tables - to find direct values, derived quantities, and trends.

  1. Bar Graph DI 6 min read
  2. Pie Chart DI 7 min read
  3. Line Graph DI 7 min read
  4. Mixed & Combination Chart DI 8 min read

Progressions

4 lessons · 231 practice questions

Recognize and solve arithmetic and geometric sequences — from finding a missing term to summing finite and infinite series.

  1. Arithmetic Progression (AP) 8 min read
  2. Geometric Progression (GP) 9 min read
  3. Sum of Series & Special Sequences 9 min read
  4. Progressions Word Problems & Applications 9 min read

Speed Math & Calculation Shortcuts

7 lessons · 224 practice questions

Sharpen raw calculation speed — multiplication and squaring shortcuts, root estimation, fast division, and instant fraction-percentage conversions for every exam's quant section.

  1. Multiplication Shortcuts 9 min read
  2. Squaring Numbers Fast 8 min read
  3. Cubing Numbers Fast 8 min read
  4. Square & Cube Root Estimation 9 min read
  5. Fast Division & Approximation 8 min read
  6. Fraction-Decimal-Percentage Conversions 8 min read
  7. Speed Math Under Time Pressure (Applications) 9 min read

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    Works out to $2.08 a month Save 30%

Frequently asked questions

What is included in JustQuant Premium?

One subscription unlocks everything: every lesson in all 16 topics (69 lessons), every practice question in the problem bank, timed mock tests, detailed analytics, a personalised daily workout and the error notebook that brings your mistakes back for review.

Which exams is it useful for?

It covers the quantitative aptitude topics that bank, SSC, CAT-style and campus-placement tests are built on: percentages, profit and loss, ratios, time and work, speed and distance, interest, averages, mixtures, number system, progressions, data interpretation and calculation shortcuts.

How do the mock tests work?

Mock tests are timed papers that you take in the browser. When you submit, your score is worked out for you and you can review every question with its solution. Questions you miss go into your error notebook so you can revisit them.

Can I cancel at any time?

Yes. If you cancel, you keep full access until the end of the period you have already paid for. Your progress and your past mock test results are kept, so you can pick up again whenever you subscribe.

Does it work on my phone?

Yes. The lessons, practice and mock tests work on phones, tablets and computers, and your progress follows your account.

I already subscribed. How do I get to my lessons?

Sign in with the account you subscribed with. As soon as you are signed in, the Learn page opens straight onto your dashboard.

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