if rs 64 amount to 83 20 in 2 years what..., Simple Interest, General Mathematics

Question:If Rs. `64` amount to Rs `83.20` in `2` years, what will Rs. `86` amount to in `4` years at the same rate percent per annum ?

A `Rs. 127.40` 
B `Rs. 124.70` 
C `Rs. 114.80` 
D `Rs. 137.60`

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+ AnswerD

+ ExplanationP `= Rs. 64`, T` = 2 years`, S.I` = Rs. 19.20`.

Rate `= ((100 xx 19.20)/(64 xx 2))%`

`= 15%`

Now, P `= Rs. 86`, T` = 4 `years, R` = 15%`

`:. S.I = Rs.((86 xx 4 xx 15)/100)`

`= Rs. 51.60`.

:. Amount` = Rs. (86 + 51.60)`

`= Rs. 137.60`.

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