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1
A sum becomes ₹14,400 in 2 years and ₹17,280 in 3 years at compound interest. Find the rate of interest per annum.
A.10%
B.15%
C.20%
D.25%
Explanation: 17280/14400 = 1.2, so the annual growth factor is 1.2. Hence, rate = 20%.
2
A product costs ₹47. What is 7% of its value?
A.27.9
B.30.9
C.32.9
D.35.9
Explanation: 7% of ₹47 = ₹32.9.
3
A product costs ₹44. What is 14% of its value?
A.56.6
B.59.6
C.61.6
D.64.6
Explanation: 14% of ₹44 = ₹61.6.
4
If the ratio of present ages of A and B is 5:7 and after 8 years the ratio becomes 7:9, what is A's present age?
A.20 years
B.25 years
C.30 years
D.35 years
Explanation: Let ages be 5x and 7x. Then (5x+8)/(7x+8)=7/9, giving x=5 and A=25 years.
5
A product costs ₹24. What is 9% of its value?
A.16.6
B.19.6
C.21.6
D.24.6
Explanation: 9% of ₹24 = ₹21.6.
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