Question:Mr.Roopchand finds that an increase in the rate of interest from `4 7/8%` to `5 1/8%` per annum increases his yearly income by Rs.`25`.His investment is : 

A `Rs. 10,000` 
B `Rs. 12,000` 
C `Rs,15,000` 
D `Rs. 20,000` 

+ Answer
A 

+ Explanation
Let the investment be Rs.x.Then,

`x + 41/8 xx 1/100 - x xx 39/8 xx 1/100`

`= 25 ⇔ 2x`

`=20000 ⇔ x`

`= 10000`

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