6- giving the following data Labor Quantity Fixed Variable Cost Cost 16 ?160 280 N 40 ?160 2160 W 60 ?160 ?240 72 2160 2320 80 2160 2400 84 2160 2480 Calculate the following : 1-Total costs. 2-Average costs . 3-Marginal costs . 4-Draw the graph of the relationship. 5- give an example for the fixed cost and the variable cost ? ....(observation