Arithmetic Aptitudes › Percentage › Question #4561
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QSince 4 x pi x radius x radius = surface area. Therefore, net % change in area = ( x + y + xy/100) % = [10 + 10 + (10 x 10)/100]% or 21%.

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  • A 21% ✔ ✖
  • B 23% ✔ ✖
  • C 26% ✔ ✖
  • D 29% ✔ ✖
Correct Answer

Explanation


We can define a variable "z" as the net percent change in surface area and
set up the following equation:

z = (x + y + xy/100)%
= (10 + 10 + (10 * 10)/100)%
= 21%

This equation shows that the net percent change in surface area is 21%
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