# Aptitude Questions on Compound Interest

1. The principle that amounts to Rs. 4913 in 3 years at 6 1/4 % per annum C.I. compounded annually, is?
A. Rs. 3096
B. Rs. 4076
C. Rs. 4085
D. Rs. 4096

D. Rs. 4096
According to the formula,
Principle = [4913 / (1 + 25/ (4 * 100))3]
=> 4913 * 16/17 * 16/17 * 16/17 = Rs. 4096
3. Find the Compound Interest on Rs.8000 at 5% per annum for 3 years when C.I is reckoned yearly?
A. Rs. 1,185
B. Rs. 1,261
C. Rs. 1,346
D. Rs. 1,440

B. Rs. 1,261
A = 8000(21/20)^3 = 9261
Now, 9261 - 8000 = Rs. 1,261
5. The difference between simple interest and C.I. at the same rate for Rs.5000 for 2 years in Rs.72. The rate of interest is?
A. 6%
B. 8%
C. 10%
D. 12%

D. 12%
5000 = 72(100/R)^2
5 R^2 = 720 => R = 12
7. The difference between compound and simple interest on a certain sum of money for 3 years at 6 2/3% p.a is Rs.184. Find the sum?
A. Rs.12,000
B. Rs.13,500
C. Rs.14,200
D. Rs.17,400

B. Rs.13,500
P = (184*10^6) / [6 2/3 * 6 2/3 *(300*6 2/3)]
P = 13500
9. A sum of money is put out at compound interest for 2 years at 20%. It would fetch Rs.482 more if the interest were payable half-yearly, then it were pay able yearly. Find the sum.
A. Rs.1,000
B. Rs.1,250
C. Rs.2,000
D. Rs.4,000

C. Rs.2,000
P(11/10)^4 - P(6/5)^2 = 482
P = 2000
11. The difference between the compound interest compounded annually and simple interest for 2 years at 20% per annum is Rs.144. Find the principal?
A. Rs.3,000
B. Rs.3,300
C. Rs.3,600
D. Rs.3,900

C. Rs.3,600
P = 144(100/5)^2 => P = 3600
13. Find the amount on Rs.8000 in 9 months at 20% per annum, if the interest being compounded quarterly?
A. Rs.9,021
B. Rs.9,162
C. Rs.9,261
D. Rs.9,621

C. Rs.9,261
A = 8000(21/20)^3 = 9261
15. Every year an amount increases by 1/8th of itself. How much will it be after two years if its present value is Rs.64000?
A. Rs.61,000
B. Rs.65,000
C. Rs.71,000
D. Rs.81,000

D. Rs.81,000
64000* 9/8 * 9/8 = 81000
17. Indu gave Bindu Rs.1250 on compound interest for 2 years at 4% per annum. How much loss would Indu has suffered had she given it to Bindu for 2 years at 4% per annum simple interest?
A. Rs.10
B. Rs.5
C. Rs.3
D. Rs.2