Question:If i purchased 11 books for tk 10 and sold all the books at the rate of 10 books for tk 11, the profit percent is: 

A 10% 
B 11% 
C 21% 
D 100% 

+ Answer
C 

+ Explanation
Suppose, the number of books purchased = `11 xx 10` = 110
C.P of 110 books  = Tk `((10)/11 xx 110)` =Tk 100
S.P of 110 books  = Tk `((11)/10 xx 110)` =Tk 121
Profit % = 21%

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Muhammad Abdullah Al Mamun

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