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

66 2 3
100
105 1 3
120

Correct answer: 100

Solution

Let cost price be C and original selling price be S. Then original profit is S - C, and new profit is 2S - C. Given 2S - C = 3(S - C), which gives S = 2C. Hence profit = C, so profit percent = 100%.

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