Medium
The salary of a worker is first increased by 10% and thereafter it was reduced by 10%. What was the change in his salary?
Explanation
Explanation
Step 1: Assume the original salary is 100 (using 100 makes percentage changes easy to track). Step 2: After a 10% increase, the salary becomes 100 × 1.10 = 110. Step 3: After a 10% decrease on this new salary, it becomes 110 × 0.90 = 99. Step 4: The salary went from 100 to 99, a net decrease of 1. So there is a 1% reduction in salary overall.
PRO TIP
Re-check your working by substituting the answer back into the original question.