The retail price of a toothpaste of 140 grams is Rs 40, the shopkeeper gives a toothbrush whose actual price is Rs 10, free with it and still gains 25%. The cost price of the toothpaste is :
A) 36 B) 24 C) 30 D) 42 E) 32

• Selling price = 40 – 10 = 30 Rupees.
  Let cost price =x;
  Selling price = cost price + profit on cost price
  30 = x + 25% of x;
  X= 24
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