A) 25 years
B) 20 years
C) 15 years
D) 10 years
Correct Answer: C
Solution :
Let the sum be Rs. x. Then x becomes 2x in 5 years, 2x becomes 4x in next 5 years, 4x becomes 8x in next 5 years. Hence x becomes 8x in 15 years.
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