If selling price is doubled, the profit triples. Find the profit percent.	Pick one:
A) 66%  B) 120%  C) 105%  D) 100%  E) 80%
Let C.P. be Rs. x and S.P. be Rs. y.   Then, 3(y - x) = (2y - x)   y = 2x.   Profit = Rs. (y - x) = Rs. (2x - x) = Rs. x.   Profit % =	x/x x 100% =100%   Answer is 100%.
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If selling price is doubled, the profit triples. Find the profit percent.