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If a sum at compound interest doubles in 6 years, in how many years will it become 8 times itself?
A12 years
B18 years
C24 years
D16 years
Answer & Solution
Correct answer: B. 18 years
1. CI doubles in 6 years → quadruples in 12 → 8× in 18.
2. Mathematically: 2 = (1+r)⁶ → (1+r)¹⁸ = 2³ = 8.
3. Time = 18 years.
_Source: jkchrome SI-CI QB, p.5 — doubling and CI growth_
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