Question 1

How do you calculate a percentage of a number?

Accepted Answer

To find X% of Y, divide X by 100 and multiply by Y. For example, 15% of 200 is (15 / 100) * 200 = 30.

Question 2

How do you calculate percentage change?

Accepted Answer

To calculate the percentage increase/decrease from A to B: subtract A from B, divide that difference by A, and multiply the result by 100. For example, from 40 to 50 is ((50 - 40) / 40) * 100 = 25% increase.