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A sum of money amounts to ₹2.5 times itself in 15 years at simple interest.
Find the rate of interest per annum.

Class 7Simple InterestComparing Quantities

A10%
B12%
C15%
D8%

Step-by-Step Solution

Take

P

= ₹100. Amount =

2.5 \times 100

= ₹250, so S.I. = ₹150 in 15 years.

R = (150 \times 100) / (100 \times 15) = 15000/1500 = 10

%.

Answer: A) 10%

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