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. 20 years

B. 12 years

C. 15 years

D. 10 years

Answer: Option C

Solution (By JKExamLibrary)

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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Question #1

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A and B can do a work in 12 days. B and C in 15 days. A and C in 20 days. If A, B, and C work together, how long will they take?

A. 8 days

B. 10 days

C. 9 days

D. 11 days

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Correct Answer: Option B

Explanation:
2(A+B+C) = 1/12 + 1/15 + 1/20 = (5+4+3)/60 = 12/60 = 1/5 → A+B+C = 1/10. Together 10 days.

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Question #2

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A trader sells an article at a profit of 20%. Had he bought it at 10% less and sold it for Rs. 30 more, he would have gained 40%. Find the cost price.

A. Rs. 700

B. Rs. 400

C. Rs. 500

D. Rs. 600

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Correct Answer: Option C

Explanation:
CP=x, SP=1.2x. New CP=0.9x, new SP=1.2x+30. Profit 40% on new CP → 1.2x+30 = 1.4×0.9x = 1.26x → 30 = 0.06x → x=500.

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Question #3

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40% of 250 + 15% of 200 = ?

A. 130

B. 135

C. 120

D. 125

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Correct Answer: Option A

Explanation:
100 + 30 = 130.

This question belongs to: Maths Percentage

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