text: ## Discussion
  
  1. A retailer increase the selling price by 25% due to which his profit percentage increases from 20% to 25%. What is the percentage increase in cost price ?
  1. 20%
  2. 30%
  3. 25%
  4. 50%
  1. ##### Correct Option: A
  
  In beginning
  Cost Price (CP) = Rs. 100
  Profit % = 20
  Selling Price (SP) = 120
  
  When profit increases from 20% to 25%
  Cost Price (CP) = y
  Profit % = 25
  Selling Price (SP) after 25% increase = 120 + 25% = Rs. 150
  
  From question
  y + 25 % profit = 150
  
  1.25 y = 150
  so y = 120
  
  % change in cost price = [ (120 - 100) / 100 ] x 100 = 20%
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