If a chair is sold at a discount of 20%, then there is a profit of 20%. If the chair is sold at a discount of 30%, then what will be the profit?

5%

        CP                   MP

      100 - D%           100 + P%

     100 - 20%           100 + 20%

         80                      120

If the discount is 30% then the SP = 70% of 120 = 84

then the profit percentage = (84 - 80) × \(\frac{100}{80}\) = 5%