How long will it take for a sum of money to grow from Rs.1250 to Rs.10,000, if it is invested at 12.5% p.a simple interest ?

A. 56 years
B. 57 years
C. 65 years
D.  45 years

1250 has become Rs. 10,000. Therefore, the interest earned = 10,000 – 1250 = 8750. => n = 700 / 12.5 = 56 years.

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