The pass rate in an annual district exam rose from 64% to 80%. What was the percentage increase in the pass rate?
Answer and explanation
Correct answer: B. 25%
- Step 1: Absolute increase = 80% - 64% = 16 percentage points. Step 2. Percentage increase relative to base = (16 / 64) 100% = (1/4) 100% = 25%. Answer: 25%. Why not the others: 16% confuses absolute percentage point change with relative percentage increase; 20% assumes base 80; 30% is an arithmetic error.
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