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A sum at 10% simple interest per annum grows to Rs 900 in 5 years. To what amount will the same sum grow at 15% simple interest in 2½ years?
ARs 820
BRs 830
CRs 835
DRs 825
Answer & Solution
Correct answer: D. Rs 825
1. With SI: P + P×0.10×5 = 900 ⇒ P(1 + 0.5) = 900 ⇒ P = 600.
2. Interest at 15% for 2.5 yr = 600 × 0.15 × 2.5 = Rs 225.
3. Amount = 600 + 225 = **Rs 825**.
_Source: IBPS RRB Officer Scale I Prelims PYQ (Examrace), Q.63_
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