The price of a kilo of fish rose from ₱80 to ₱100. What was the percentage increase?
Correct answer: C. 25%
Increase = ₱20. Percentage increase = increase ÷ original price × 100 = 20 ÷ 80 × 100 = 25%. Dividing by the new price (100) instead gives the wrong answer 20%.
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