Rajat borrows certain sum at certain interest rate from a bank which charges simple interest. he deposits the same sum at the same interest rate in another bank which offers compound interest. if the ratio of difference of interests calculated by both the bank after 3 years to that after 2 years is 31/10 ,find rate of interest.
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2pr/100=840
r=840×100/2p
sl+r×rp=ci
p=((840×100)^2)/4×21×10000
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