​chapter name: simple interest
13. anwar lends a sum of money at the rate of 16% per annum and receives rs 736 as interest. if he had lent the sum for 4 years more, he would have received rs 3680 as interest. find the sum of money.

Let the principal, P = Rs xTime, T1 = y yrsRate, R = 16% p.a.    I1 = Rs 736PRT1100=736x × 16 × y100 = 736xy = 4600Now, in the second case we havePrincipal, P = Rs xTime, T2 = y+4 yrsRate, R = 16% p.aNow, I2 = 3680PRT2100 = 3680x × 16 × y+4100 = 3680xy+4 = 23000xy + 4x = 230004600 + 4x = 230004x = 18400x = 184004 = 4600So, sum of money = x = Rs 4600

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