Calculate the effective rate of protection for the domestic MP3 player industry following the imposition of a 20 percent tariff on the imports of MP3 players . T he cost of material inputs used in production of MP3 players in the country is $100 per unit and there is free trade in these material inputs. T he world price of MP3 players is $175 per unit . Assume that the country is a small country. a. 20% b. 462⁄3% c. 90 % d. 72 2⁄3%