Percentage problems involving two variables

In this post we will see how to deal with percentage problems involving two variables.

Consider the two problems on percentage given below,

  • If A x B = k, where A and B are variables and k is constant, then if A increases by 10%, what is the percentage change in B?
  • If A’s salary is 20% less than B, then by what percent is B’s salary more than that of A?

These kinds of percentage problems are basic and very important ones. They can be solved using various techniques. In the video below, we have explained how to solve these problems with the help of a formula.

Math Tricks Workout

Please do try our android app – Math Tricks Workout. The app is developed to improve mental arithmetic using a series of left to right fast math workouts.

Scan the QR code below or click on it for more details.
qr code


− 2 = 1