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A sum of money doubles itself in 10 years at simple interest.
What is the rate of interest per annum?

Class 7Simple InterestComparing Quantities

A10%
B5%
C20%
D100%

Step-by-Step Solution

If a sum doubles, the interest equals the principal. Take

P

= ₹100, S.I. = ₹100,

T = 10. R = (100 \times 100) / (100 \times 10) = 10

%.

Answer: A) 10%

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