The simple interest on a sum for 3 years at 10% is 21 more than the simple intrest on the same sum for 1 year at 5% . Find the sum
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simple interest=PTR/100 where P is sum, T is time in years, R is rate of interest
P*3*10/100=(P*1*5/100)+21
3P/10-P/20=21
5P/20=21
P=84
so, sum=84
P*3*10/100=(P*1*5/100)+21
3P/10-P/20=21
5P/20=21
P=84
so, sum=84
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