B as a percentage of A is equal to A as a percentage of (A+B). Find B as a percentage of A. Select the correct option.
A) 62 % B) 73 % C) 41 % D) 71 % E) none of these

Rationale: explanation : according to the question : - = > b / a = a / ( a + b ) . as b is a percent of a , let us assume b = ax . then , equation ( 1 ) can be re - written as = > x = 11 + x . = > x ( 1 + x ) = 1 . = > x 2 + x + 1 = 0 . = > x = − 1 ± 5 / √ 2 thus , x = − 1 + 5 / √ 2 = > 0.62 . = > 62 % . answer : a
Answer: A