On selling a chair forRs. 720, a man loses 25%. To gain 25% it must be sold for

By selling a radio for Rs. 950, a man loses 5%. What per cent shall he gain by selling it for Rs. 1040?

The selling price of an article is of the cost price. The gain per cent is

The ratio of cost price and selling price of an article is 20 : 21. What is the gain per cent on it?

A man sold two chairs for Rs.500 each. On one he gains 20% and on the other he loses 12%. His net gain or loss per cent is