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1. A person makes a profit of 10% on 25% of the quantity and a loss of 20% on the rest. What is the percentage gain or loss on the whole?

  • A. 10%
  • B. 10%
  • C. 10%
  • D. 10%

Answer: Option B

Explanation:

Suppose cost price  =  100 Tk.
Gain on 25Tk  =  2.50 Tk  =  Selling price  =  25   +  2.50  =  27.50 TK 
Loss on 75 Tk  =  15 Tk Selling price  =  75  -  15  =  60 Tk 
Total selling price  =  60   +   27.50  =  87.50 
Loss  =  100  -  87.50  =  12.50

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