the simple interest on a sum of money will be rs 600..., Simple Interest, General Mathematics

Question:The simple interest on a sum of money will be Rs.`600` after `10` years. If the principal is trebled after `5` years, what will be the total interest at the end of the tenth year ?

A `Rs. 600` 
B `Rs. 900` 
C `Rs. 1200` 
D Date inadequate

/61

+ AnswerC

+ ExplanationLet sum = x,S.I. Rs.` 600`, TIme = `10` years

Rate` = ((100 xx 6000)/(x xx 10))`

`= (6000/x)%`

S.I. for first `5` years 

`= Rs. ((x xx 5 xx 6000)/(x xx 100))`

`= Rs. 300`

S.I. for first `5` years

`= Rs. (3x xx 5 xx 6000/(x xx 100))`

`= Rs. 900`.

:. Total interest` = Rs. 1200`.

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