A shopkeeper offered a discount of 15% on the labeled price. By selling an article for Rs. 340, after giving discount, he earned a profit of 13 1/3%. What would have been the percent profit earned if no discount was offered?
A) 0.2 B) 0.3333 C) 0.1717 D) 0.25

• 33.33%
  
  Let the Cost Price=x and List Price=y, then
  85% of y = (100+13 1/3)% or 340/3% of x
  => 85y = (340/3)x
  => y/x = 4/3
  y as a percentage of x =100*4/3= 400/3 = 133.33
  So when no discount was offered, % profit earned= 33.33
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