The population of a school increased from 400 to 480 pupils in one year. What was the percentage increase?
Answer and explanation
Correct answer: A. 20%
- Step 1: Actual increase = 480 - 400 = 80 pupils. Step 2. Percentage increase = (Increase / Original Population) 100% = (80 / 400) 100% = 20%. Answer: 20%. Why not the others: 16.7% calculates increase on the new population (80/480); 25% assumes base of 320; 80% confuses 80 pupils with 80%.
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