The table below shows how output changes as inputs change. The wage rate is £5 and the rental rate (cost) of capital is £2. Calculate the lowest cost method of making 4, 8 and 12 units of output. There are two methods of producing each level of output.
Capital 4 2 7 4 11 8
Labour 5 6 10 12 15 16
Output 4 4 8 8 12 12