Calculate per unit cost of production in this economy?

The cost of production is crucial for the standard of living of Canadians. Assume the Canadian economy is employing 2 units of capital (robots), 5 units of raw materials(natural gas), and 8 units of labour (skilled) to produce its total output of 640 units. Each robot costs $20, each unit natural gas, $8, and each unit of the skilled labour, $6.