A) 20%
B) 40%
C) 60%
D) 72.8%
Correct Answer: D
Solution :
Short-cut method If height and radius both of a cylinder change by x%, then volume changes by \[\left[ 3x+\frac{3{{x}^{2}}}{100}+\frac{{{x}^{3}}}{{{100}^{2}}} \right]%\] \[=\left[ 3\times 20+\frac{3\times 20\times 20}{100}+\frac{20\times 20\times 20}{10000} \right]%\] \[=(60+12+0.8)%=72.8%\]You need to login to perform this action.
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