Arithmeticmedium · Past Paper
If the side of a square is increased by 10%, its area increases by:
A10%
B20%
C21%
D100%
✓ Correct Answer: C — 21%
New area = (1.1s)^2 = 1.21s^2. Increase = 1.21 - 1 = 0.21 = 21%.
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