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1. A trader marked the selling price of an article at 10% above the cost price. At the time of selling he allows certain discount and suffers a loss of 1%. He allowed the discount of ?

A. 11%

B. 10%

C. 9%

D. 10.5%

Solution:

Let the cost price of an article = Rs. 100
Marked price of an article = Rs. 110 (10% above)
Selling price of an article = Rs. 99 (10% discount)

\begin{aligned} Difference = 110 - 99 \\ =  Rs . 11 \\ Discount = \frac{11}{110} \times 100 \\ = 10 % \end{aligned}

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