A shopkeeper allows 3 successive discounts of 50%, 40% and 20% respectively. Find out equivalent discount.

76%

                 M.R.P.    :      S.P.

-50% ⇒          2       :       1

-40% ⇒          5       :       3

-20% ⇒          5       :       4

                   _____________

Total effect:   50      :      12     (*product of the above ratios)

                     100     :      24   ⇒⇒ 76% equivalent discount.