Question:The rent of a guest house was Rs `50`per day for first three days ,Rs `100`per day for next `5`days and Rs `300`per day for other days .The registration fee in the begining is Rs`50`.If one has to pay Rs `1300`,for how many days he availed of this facility ? 

A `7` 
B `8` 
C `9` 
D `10` 

+ Answer
D 

+ Explanation
`(50 + 50 xx 3 + 100 xx 5 + x xx 300)= 1300`

or `300x = 600`

or` x = 2`.

:. Total number of  days 
`= (3 + 5 + 2) days = 10 days `.

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Irin Moni

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