Question:A manufacture sells a pair of glasses to a wholesale dealer at a  profit of 18% The wholesaler sells the same to a retailer at a profit of 20%. The retailer in turn sells them to a customer for Rs. 30.09, thereby earning a profit of 25%. The cost price of the manufacturer is : 

A Rs. 15 
B Rs. 16 
C Rs. 17 
D Rs. 18 

+ Answer
C 

+ Explanation
`(125)/(100) 0f (120)/(100) of (118)/(100) x = 30.09`

`:. x = ((30.09 xx 100 xx 100 xx 100)/(125 xx 120 xx 118))`

`= ((3009 xx 4)/(6 xx 118))`

`= 17`

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