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(B) Let the cost price be $C.P.$ and the initial selling price be $S.P.$Initial profit $= S.P. - C.P.$According to the problem,if the selling price is

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$100 \%$

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(B) Let the cost price be $C.P.$ and the initial selling price be $S.P.$Initial profit $= S.P. - C.P.$According to the problem,if the selling price is doubled $(2 S.P.)$,the profit becomes three times the original profit.So,$2 S.P. - C.P. = 3(S.P. - C.P.)$$2 S.P. - C.P. = 3 S.P. - 3 C.P.$Rearranging the terms,we get $3 C.P. - C.P. = 3 S.P. - 2 S.P.$$2 C.P. = S.P.$Now,the profit percent is calculated as $\frac{S.P. - C.P.}{C.P.} 	imes 100$.Substituting $S.P. = 2 C.P.$,we get $\frac{2 C.P. - C.P.}{C.P.} 	imes 100 = \frac{C.P.}{C.P.} 	imes 100 = 100 \%$.

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

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