John sold an article to Peter at 20% profit and Peter sold it to Mohan at 5% loss. If Mohan paid ₹ 912 for the article, find how much did John pay for it?

By selling an article for ₹ 1,200, Rohit loses one-fifth of its cost price. For how much should he sell it in order to gain 30% ?

25% of the cost price of an article is ₹ 600. Find its selling price when it is sold at a profit of 25%.

A man sold a bicycle at 5% profit. If the cost had been 30% less and the selling price ₹ 63 less, he would have made a profit of 30%. What was the cost price of the bicycle?