By selling an article for Rs. 2,340, the dealer loses 10%. At what price should he sell the article to gain 15%?

Given: 

Selling Price(SP) = Rs. 2340 

Loss % = 10% 

To find: Selling price for 15% gain.

Formula Used: 

​$$\text{ Loss \%} = \frac{ CP - SP}{CP} \times 100$$ 

$$\text{Gain \%} = \frac{SP - CP}{CP} \times 100$$ 

Solution: 

Form 10% loss;

Cost Price (CP) = $$\frac{ 2340}{90}\times 100 = 2600$$ 

Now to gain 15%;

Selling Price(SP) = $$2600 \times\frac{115}{100} = 2990$$ 

Thus, For 15% gain, Selling price should be Rs. 2990.