Question:Satish took a loan at `10%`p.a. S.I. After `4` years ,he returned the principal along with the interest. If he returns in all Rs. `3500`, what is the principal amount ? 

A `Rs. 3250` 
B `Rs. 2500` 
C `Rs. 3150` 
D `Rs.2100` 

+ Answer
B 

+ Explanation
Let the principal be Rs.x.Then,

`x + (x xx 10 xx 4)/100`

`= 3500 ⇔ (140x)/100`

`= 3500 ⇔ x `

`= (3500 xx 100)/140`

`= 2500`

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