Question

A positive integer $m$ is increased by 20% and the resulting number is 1080. Then the integer $m$ is

• A. 900
• B. 880
• C. 920
• D. 890

Hint:

Increase by $x\%$ means multiply original value by $(1 + \frac{x}{100})$.

Answer 1

The Correct Option is A

Concept: Increase by 20% means multiply by 1.2. 
Explanation: \[ 1.2m = 1080 \] \[ m = \frac{1080}{1.2} = 900 \]