A shopkeeper gains 17% after allowing a discount of 10% on the marked price of an article. Find his profit percent if the articles are sold at market price allowing no discount.
1). 27%
2). 37%
3). 23%
4). 30%
For simplicity assuming the market price to be Rs 100. So on one article by selling at 90% i.e., at SP of Rs 90, shopkeeper gains 17%. Let’s assume the cost of article as C.
So, $(gain\ percent = \left( {\frac{{SP - CP}}{{CP}}} \right) \times 100)$
$(\Rightarrow 17 = \left( {\frac{{90-C}}{C}} \right) \times 100)$
C = Rs 76.92
Now if SP would have been Rs 100.
$(\begin{array}{l} Gain\ percent = \frac{{SP - CP}}{{CP}} \times 100\\ Gain\ percent = \left( {\frac{{100-76.92}}{{76.92}}} \right) \times 100 = 30\% \end{array})$