A man gains 40% by selling an article for a certain price. If he sells it at double the price, the percentage of profit will be. Select the correct option:
A) 130%
B) 180%
C) 150%
D) 160%
E) 170%
Explanation:   Let the C.P. = x,   Then S.P. = (140/100)x = 7x/5   New S.P. = 2(7x/5) = 14x/5   Profit = 14x/5 - x = 9x/5   Profit% = (Profit/C.P.) * 100   =&gt; (9x/5) * (1/x) * 100 = 180 %   Option 180%
<result>B</result>
A man gains 40% by selling an article for a certain price. If he sells it at double the price, the percentage of profit will be.