Question:Rahim buy mangoes at the rate of 3 kg for tk 21 and sell them at 5kg for tk 50. To earn tk 102 as profit, he must sell: 

A 26 kg 
B 32 kg 
C 34 kg 
D 56 kg 

+ Answer
C 

+ Explanation
Rate of buy =tk 7 per kg
Rate of selling =tk 10 per kg
To gain tk 3 , he must buy = 1kg
To gain tk 120 , he must buy = `(1/3xx102)kg = 34 kg.

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Muhammad Abdullah Al Mamun

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