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If the sides of a square are increased by 10%, by what percent does the area increase?
A20%
B21%
C10%
D25%
Answer & Solution
Correct answer: B. 21%
1. New side = 1.10 × old side.
2. New area = (1.10)² = 1.21 × old area.
3. Increase = 21%.
_Source: jkchrome Percentage QB, p.4 — area % change_
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