Question:The simple interest on a sum of money is `1/9` of the sum. The number of years is numerically equal to the rate percent per annum. The rate percent per annum is : 

A `3 1/3` 
B `5` 
C `6 2/3` 
D `10` 

+ Answer
A 

+ Explanation
Let sum = x.Then, S.I.`= x/9`

Let time = n years and rate = n%

Then, n`= 100 xx x/9 xx 1/(x xx n)`

`or n^2 = 100/9`

`or n = 10/3`

`= 3 1/3%`

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