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1. How much percent more than the cost price should a shopkeeper mark his goods so that after allowing a discount of 25% on the marked price, he gain 20% ?

A. 70%

B. 50%

C. 60%

D. 55%

Solution:

\begin{aligned} Let the cost price  =  Rs . 100 \\ Selling price  =  120 % of 100 \\ =  Rs . 120 \\ Market price  =  120 \times \frac{100}{75} \\ =  Rs . 160 \\ Above % = \frac{160 - 100}{100} \times 100 \\ = 60 % \end{aligned}

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