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1. A shopkeeper purchased a chair marked at Rs. 600 at two successive discounts of 15% and 20% respectively, he spent Rs. 28 on transportation and sold the chair for Rs. 545. His gain percent was = ?

A. 25%

B. 30%

C. 35%

D. 20%

Solution:

Marked price of chair = Rs. 600
After discount, cost price

\begin{aligned} =  600 \times \frac{85}{100} \times \frac{80}{100} \\ = Rs . 408 \end{aligned}

After transportation charges cost price

\begin{aligned} = 408 + 28 \\ =  Rs . 436 \\ Gain % \\ = \frac{545 - 436}{436} \times 100 % \\ = \frac{109}{436} \times 100 % \\ = 25 % \end{aligned}

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