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### Discussion :: Compound Interest

1. Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is:

2.  A. Rs. 1550 B. Rs. 1650 C. Rs. 1750 D. Rs. 2000

Answer : Option C

Explanation :

C.I.=Rs.[4000$$*(1+\frac { 10 } { 100 } )^2-4000]$$

.=Rs.[4000x$$\frac { 11 } { 10 }$$x$$\frac { 11 } { 10 }$$-4000]

=Rs.840

Sum = Rs.$$[ \frac { 420*100 } { 3*8} ]$$= Rs. 1750.

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