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A sum doubles itself at simple interest in 8 years. What is the rate of interest?
A10%
B12.5%
C15%
D20%
Answer & Solution
Correct answer: B. 12.5%
1. If sum doubles, SI = principal.
2. P = P × R × 8 / 100.
3. R = 100 / 8 = 12.5%.
_Source: jkchrome SI-CI QB, p.1 — doubling at SI_
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