A firm's output, variable costs, and total costs are given in the table below. Instructions: Enter your answers as a whole number a. Calculate marginal cost using the formula given in the chapter: ATotal cost/AQuantity. Variable cost Quantity Total cost ($) Marginal cost ($) 100 60 1 160 60 2 110 210 50 189 3 280 70 4 270 370 90 5 400 500 130 b. Calculate Variable cost/AQuantity. Variable cost Quantity Total cost ($) AVariable cost ($)/ AQuantity 0 0 100 1 60 160 60 2 110 210 50 3 188 280 4 270 370 MAWAN 5 400 500