Question:By selling an article for tk 19.50, a dealer makes profit of 30%. By  how much should he increase his selling price so as to make a profit of 40%? 

A Tk 1.50 
B Tk 1.75 
C Tk 2 
D Tk 3 

+ Answer
A 

+ Explanation
Here, `130:19.50` = `140 : x`
  or, `(130)/19.50` = `140/x`
  0r, x =`(140xx19.50)/130`
        =21
Hence,S.P to be increased = Tk (21-19.50)
                  =tk1.50

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Muhammad Abdullah Al Mamun

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