Question:By selling a pen for tk 15, a man loses on- sixteenth of what is costs him. The cost price of the pen is: 

A Tk 18 
B Tk 20 
C Tk 21 
D Tk 16 

+ Answer
D 

+ Explanation
Let the C.P be tk x
Then, x - 15 = `x/16`
or,x-`x/16` = 15
or, `15x/16` =15
or, x = 16
`:.`C.P = tk 16

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Muhammad Abdullah Al Mamun

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