When the price of cloth is decreased by 35%, the quantity of cloth sold increased by 45%. What was the effect on gross receipt of the shop?

8.25%

             Original   :   New

Price:       20        :      13             [35% = \(\frac{7}{20}\)]

Qty :        20        :      29             [45% = \(\frac{9}{20}\)]      

              ——————————   

Receipt:    400       :     367

                400       :      367     ⇒ 33 (decrease)

Decreased percentage = \(\frac{33}{400}\) × 100% = 8.25%