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Subject :IMO    Class : Class 8

The difference between compound interest and simple interest for 3 years @ 20% p.a. is Rs. 152. What is the principal lent in each case ?

(a) Rs. 1200

(b) Rs. 1155

(c) Rs. 1187.50

(d) None of these


How

Ans 1:

Class : Class 10
Ans: (c) 1187.50 Let the principal be x. A=P(1+R\100)(1+R\100)(1+R\100)=x(1 + 20\100)(1 + 20\100)(1 + 20\100) =216x\125.; CI=(A-P)=(216x\125 - x)=91x\125.; SI=(P*R*T)\100=(x*3*20)\100=3x\5.; A to Q = 91x\125 - 3x\5=152 16x\125=152.; x=152*125\16.; x=1087.50

Ans 2:

Class : Class 8
d

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