If radius of a sphere is decreased by 24%, by what per cent does its surface area decrease?

44%
49%
42.24%
46.2%

Correct Answer: 42.24%

Explanation:

According to the formula,
Percentage decrease in surface area = [2 x (-24) + (-24) x (-24)/100]%
= [-48 + 5.76]% = - 42.24%

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