Question:A man buys oranges at  tk 5 a dozen and equal number at tk 4 a dozen. He sells them at tk 5.50 a dozen and make a profit of rs 50. How many oranges does he buy? 

A 30 Dozen 
B 40 Dozen 
C 50 Dozen 
D 60 Dozen 

+ Answer
C 

+ Explanation
C.P of 2 dozen oranges = Tk (5 + 4)
= 9 Tk
S.P of 2 dozen oranges = Tk 11
If profit is Tk 2, oranges bought = 2 dozen
If profit is Tk 50, oranges bought = `(2/2 xx 50)` dozen
= 50 dozen

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Muhammad Abdullah Al Mamun

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