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

By selling a radio for Rs.240, I lose 20%. What percent shall I gain by selling it for Rs.320?

By selling a tape-recorder for Rs. 760, I lose 5%. What percent shall I gain by selling it for Rs. 1000 ?

Ravish lost 20% by selling a radio set for Rs. 3072. What percent will he gain by selling it for Rs. 4080?

On selling an almirah for Rs. 20350, a man gains 10%. What per cent does he gain on selling the same for Rs. 19610?

By selling a watch for Rs. 1440, a man losses 10%. At what price should he sell it to gain 10%?

By selling an article for र720, a man loses 10%. At what price should he sell it to gain 5%?