Question:Vishal lent Rs.`150`to Sandeep for `4` years and Rs.`600` to Deepak for `2`years. If he receives Rs.`90` as simple interest altogether, the rate of interest is : 

A `12%` 
B `10%` 
C `5%` 
D `4%` 

+ Answer
C 

+ Explanation
Let the rate be R% per annum.Then ,

`(150 xx R xx 4)/100 + (600 xx R xx 2)/100`

`= 90 ⇔ 18R`

`= 90 ⇔ R`

`= 5%`

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Irin Moni

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