Multiple choice general knowledge math & puzzles

A number is increased by 20% and then it is decreased by 10%. Find the net increase or decrease in %

  1. 10% increase

  2. 10% decrease

  3. 8% increase

  4. 8% decrease

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let the number be 100. Increase by 20% = 120. Decrease 120 by 10% (12) = 108. The net change from 100 to 108 is an 8% increase. Formula: x + y + (xy/100) => 20 - 10 + (20 * -10 / 100) = 10 - 2 = 8%.