If the sides of a square increase by 10%,how much will the area be increased in percentage?
Solution
Correct Answer: Option B
Original side length: x New side length: x + 10% x = 1.1 x Original area = x^2 New area = (1.1 x)^2 = 1.21 x^2 So we've increased area by factor of 1.21 = 1 + 0.21 = 1 + 21% So we've increased area by 21%
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