(a(i))[2]
Calculate how much he earns in one year when the profit is $320600$.
(a(ii))[2]
Calculate the percentage rise in the profit.
(b)[2]
Find the ratio of their earnings in simplest form.
(c)[2]
Work out the cost of the materials in dollars if the exchange rate is $1 = 7.06$ yuan. Give your answer correct to the nearest dollar.
(d)[3]
Calculate how much interest he pays at the end of the 3 years.