Question:A man lends Rs. `10000` in four parts. If he gets `8%` on Rs. `2000 ; 7 1/2%` on Rs. `4000` and `8 1/2%`on Rs. `1400 ;` what percent must he get for the remainder, If his  average annual interest is `8 : 13% ?` 

A `10 1/2%` 
B `9 1/4%` 
C `9%` 
D `7%` 

+ Answer
C 

+ Explanation
`((2000 xx 8 xx 1)/100) + (4000 xx 15/2 xx 1/100) + (1400 xx 17/2 xx 1/100)

+ 2600 xx R xx 1/100`

`= 813/10000 xx 10000`.

`or 160 + 300 + 119 + 26R`

`= 813`

`or R = 9`.

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Irin Moni

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