When the price of commodity is decreased by 45%, the quantity of cloth sold increased by 30%. What was the effect on gross receipt of the shop?

26.5%

             Original   :   New

Price:       20        :      11             [45% = \(\frac{9}{20}\)]

Qty :        10        :      13            [30% = \(\frac{3}{10}\)]     

             ——————————   

Receipt:    200      :     143

                 200     :      143     ⇒ 53 (decrease)

Decreased percentage = \(\frac{53}{200}\) × 100 = 26.5%