If selling price is doubled, the profit triples. Find the profit percent:

A. 66 2/3
B. 100
C. 105 1/3
D. 120
Explanation:
Let C.P. be Rs. x and S.P. be Rx. y.
Then, 3(y – x) = (2y – x) => y = 2x
Profit = (y – x) = Rs. (2x – x) = Rs. x
Profit % = x/x * 100 = 100%.