Question
If the difference between the simple interest and
compound interest, compounded annually, on Rs. 40,000 at (r + 4)% rate of interest for 2 years is Rs. 256, find the time to double an investment at (r + 6)% p.a. simple interest.Solution
ATQ, 
For doubling the amount at = (r+6) = 10% 10t = 100 t = 10 yrs
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