Question

If the difference between the simple interest and compound interest, compounded annually, received on a principal amount of Rs. 25000 at an interest rate of (a + 2)% for 2 years is Rs. 160, calculate the time required for an investment at a simple interest rate of (a + 4)% per annum to double.

A 15 yrs
B 25 yrs
C 18 yrs
D 10 yrs
E none of these
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