1. The compound interest (compounded annually) on Rs. 9300 for 2 years at the rate of R% p.a. is Rs. 4092. Had the rate of interest been ( R10), what would have been the interest on the same sum of money for the same time? (2 years)

(1) Rs. 1945

(2) Rs. 2046

(3) Rs. 1974

(4) Rs. 2027

(5) Rs. 1953

(Indian Bank PO (Pre.) Exam, 21.01.2017 (2nd Sitting))

Show Answer

Correct Answer: 25. (5)

Solution:

(5) Amount = Rs. (9300+4092) = Rs. 13392

A=P(1+R100)T

13392=9300(1+R100)2

133929300=(1+R100)2

144100=(1210)2=(1+R100)2 1+R100=1210 R100=12101=210 R=210×100=20

New rate =(R10)

 C.I. =P[(1+R100)T1] =9300[(1+10100)21] =9300[(1110)21] =9300(1211001) =9300×21100= Rs. 1953



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