A sum of money at compound interest doubles in 5 years. How many years will it take to become 8 times? MCQ with Answer and Explanation

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A sum of money at compound interest doubles in 5 years. How many years will it take to become 8 times?

A. 10 years

B. 15 years

C. 12 years

D. 20 years

Answer: Option B

Solution (By JKSSB Mock Tests)

2^3=8. Since doubles in 5 years, 8 times = 3 intervals of 5 = 15 years.

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

If 18% of x is 90, then x = ?

A. 450

B. 400

C. 550

D. 500

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Correct Answer: Option D

Explanation:
0.18x = 90 → x = 500.

This question belongs to: Maths Percentage

Question #2

If 60% of a number is subtracted from another number, the second number reduces to 52% of itself. Find the ratio of the first to the second.

A. 5:8

B. 4:5

C. 3:4

D. 2:3

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Correct Answer: Option B

Explanation:
y - 0.6x = 0.52y → 0.48y = 0.6x → x/y = 0.48/0.6 = 4/5.

This question belongs to: Maths Percentage

Question #3

Difference between a number and its 3/5 is 300. 20% of that number:

A. 150

B. 120

C. 180

D. 100

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Correct Answer: Option A

Explanation:
x - 0.6x = 0.4x = 300 → x = 750, 20% = 150.

This question belongs to: Maths Percentage

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