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

A. $66 \frac{2}{3}$

B. 100

C. $105 \frac{1}{3}$

D. 120

Solution:

\begin{aligned} Let C .P . be Rs . x and S .P . be Rs . y \\ Then, 3 (y - x) = (2 y - x) \\ \Rightarrow y = 2 x \\ Profit = R s . (y - x) \\ = R s . (2 x - x) \\ = R s . x \\ ∴ Profit % \\ = (\frac{x}{x} \times 100) % \\ = 100 % \end{aligned}

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