1. Simple interest on a certain sum at a certain rate for 2 years is Rs. 160 and compound interest on the same sum at the same rate and for the same period is Rs. 170. The rate of interest per annum is :






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  • By: anil on 05 May 2019 01.22 am
    Simple interest remains same in every year. => Simple interest for 1 year = Rs. 80 Difference of C.I. and S.I. for two years = Rs.(170 - 160) = Rs. 10 => Interest for 1 year on Rs. 80 = Rs. 10 => $$frac{80 imes r imes 1}{100} = 10$$ => $$r = frac{100}{8}$$ = 12.5%
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