Question:The rate of simple interest on a sum of money is `6%`p.a for the first `3` years `8%`p.a .for the next `5` years and `10%` p.a. for the period beyond `8` years. If the   simple interest accrued by the sum for a total period of `10` years is  Rs. 1560`,what is the sum ? 

A `Rs. 1500` 
B `Rs. 2000` 
C `Rs. 3000` 
D Date inadeequate 

+ Answer
B 

+ Explanation
Let the  sum be Rs.x.Then.

`(x xx 6 xx 3)/100 + (x xx 8 xx 5)/100 + (x xx 10 xx 2)/100 = 1560`

`or 78x = 156000`

`or x = 2000`.

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