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  • Find the rate at Simple interest, at which a sum becomes four times of itself in 15 years.
Question 1:
Find the rate at Simple interest, at which a sum becomes four times of itself in 15 years.
A. 10%
B. 20%
Feedback Let sum be x and rate be r%
then, (x*r*15)/100 = 3x
r = 20%
C. 30%
D. 40%

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