A shopkeeper earns a profit of 16% if he allows a discount of 20% on the marked price of an article. What will be the profit percent earned by the shopkeeper if he sold the article at its marked price ?

45%

        CP                    MP

      100 - D%           100 + P%

     100 - 20%           100 + 16%

         80                      116

If he allows no discount on the MP then the profit = 116 - 80 = 36

Profit% = 36 × \(\frac{100}{80}\) = 45%