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In how many years will a sum become 4 times itself at 25% p.a. simple interest?
A10 years
B12 years
C15 years
D20 years
Answer & Solution
Correct answer: B. 12 years
1. Amount = 4P → SI = 3P.
2. 3P = P × 25 × T / 100.
3. T = 300/25 = 12 years.
_Source: jkchrome SI-CI QB, p.3 — time for n-fold growth_
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