Supposing that the free trade price of a finished cellphone is R1 000 (i.e. it is a finished good). Note that this particular cellphone is made from aluminium alloys that cost R500 per cellphone, and this material is imported from South Korea. Finished cellphones from outside the country have a tariff of 10% imposed on them, whereas imported aluminium alloys are charged a duty.

Required:

2.1 How can i calculate the rate of effective protection if the duty on imported aluminium alloys is 5%.

2.2 How can i calculate the rate of effective protection if the duty on imported aluminium alloys is 10%.

2.3 How can i calculate the rate of effective protection if the duty on imported aluminium alloys is 15% and the price of a finished cellphone has increased to R1 200 in South Africa.