A man gains 60% by selling an article for a certain price. If he sells it at double the price, the percentage of profit will be.  Choose the correct choice from the following options.
A) 130 %  B) 320 %  C) 150 %  D) 160 %  E) 170 %

Rationale: "explanation : let the c . p . = x , then s . p . = ( 160 / 100 ) x = 8 x / 5 new s . p . = 2 ( 8 x / 5 ) = 16 x / 5 profit = 16 x / 5 - x = 16 x / 5 profit % = ( profit / c . p . ) * 100 = > ( 16 x / 5 ) * ( 1 / x ) * 100 = 320 % option b"
Answer: B