Question:A man bought a house for Rs.` 5` lakhs and rents it. He puts `12 1/2%` of each month's rent aside for repairs, pays Rs.`1660` as annual taxes and realises `10%` on his investment thereafter. The monthly rent of the house is : 

A `Rs. 5000` 
B `Rs. 4920` 
C `Rs. 2500` 
D `Rs. 2460` 

+ Answer
B 

+ Explanation
Suppose monthly rent 

 = Rs. x Then,

`12x - (25)/2% of 12x - 1660`

`⇒ 10% of 500000`

`⇒ 12x - (25)/200 xx 12x - 1660`

`⇒ 500000`

`⇒ (21x)/2`

`= 51660 or x`

`= (51660 xx 2/21)`

`= 4920.`

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