A man buys a watch for rs. 1950 in cash and sells it for rs. 2200 at a credit 0f 1 year. if the rate of interest is 10% per annum, the man :
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after 1 year men gets interest I =2200*10*1/100=220
amount =2420
total profit=2420-1950
=470
amount =2420
total profit=2420-1950
=470
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