Xiaomi is currently using labour and capital to produce their latest flagship smartphones. Given that the wage rate is $X, the rental price of capital is $7.00, and the marginal product of capital is 1.618. Select a value for X between [18-35].

i) What must the marginal product of labour be if the firm seeks to minimize cost?

ii) Suppose the MPK was unknown and the MPL was given as 9.81. What must the MPK be if the firm seeks to minimize cost?