Iliana’s math grade increased from 65 to 86. Fiona’s math grade increased from 70 to 80. What is the difference, rounded to the nearest whole number, between the approximate percent increases?

Iliana’s grade increased by 21 points, so her percent increase was about (21 ÷ 65) × 100 = 32%. Fiona’s grade increased by 10 points, so her percent increase was about (10 ÷ 70) × 100 = 14%. The difference is about 32% − 14% = 18%, so the correct choice is 18 percent.

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