A certain sum is invested for T years It amounts to Rs 400 at 10 per annum But when invested at 4 pe...........

Quantitative Aptitude ( CCS) Simple Interest

A certain sum is invested for T years. It amounts to Rs. 400 at 10% per annum. But when invested at 4% per annum, it amounts to Rs. 200. Find the time (T)?

39 years

41 years

45 years

50 years

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Explanation:

We have, A1 = Rs. 400, A2 = Rs. 200, R1 = 10%, R2 = 4%
Time (T) = [A1 – A2] x 100 divide by A2R1 – A1R2
= [400 – 200]x 100 divide by [200 x 10 – 400 x 4]= 20000/400 = 50 Years.