Gain percentage is 25%

its 25% above cost

3/15*100=20%

The cost price of 20 articles is the same as the selling price of x articles. If the profit is 25%, then what is the value of x ?

An article when sold at a gain of 5% yields Rs. 56 more than what sold at a loss of 15%. What is the cost price of the article?

Mohan sold a book at a loss of 40%. If the selling price had been increased by Rs. 200, there would have been a gain of 10%. What was the cost price of the book?

A bike is sold at a certain price. By selling it at two third of that price one loses 10%. Find the gain percent at original price.

If buying price of 8 notebook is equal to the selling price of 10 notebooks. What is the percentage profit or loss in this trade.