Question:A man borrowed Rs. `800`at `10%` per annum simple interest and immediately lent the whole sum at `10%` per annum compound interest. What dose he gain at the end of `2` years ? 

A `Rs. 6` 
B `Rs. 8` 
C `Rs. 10` 
D `Rs. 12` 

+ Answer
B 

+ Explanation
C.I.= Rs.` [ 800 xx (1 + 10/100)^2 - 800]`

`= Rs. 168.`

S.I. Rs.`((800 xx 10 xx 2)/100)`

`= Rs. 160`

Gain = (C.I) - (S.I)

`= Rs. (168 - 160)`

`= Rs.= 8`

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