The table below presents the average and marginal cost of producing cheeseburgers per hour at a roadside diner. Cheeseburger Production Costs Quantity (burgers Average Variable Average Total Marginal Cost per hour) Cost (dollars) Cost (dollars) (dollars) $1.ee 36.68 $1.ea 20 2.76 3. 58 8.49 36 9. 70 2.57 40 0.78 2.18 1.98 50 0.98 2.09 1.38 60 1.07 2.09 2.09 70 1. 34 2.14 3.08 1.74 2.44 1.58 2.23 2.06 6,28 2. 81 3.37 8. 80 a. When moving from producing a quantity of 40 cheeseburgers per hour to 50 cheeseburgers per hour, the average total cost of ranges production is (Click to select) and the marginal cost of cheeseburger production is (Click to select] s b. When moving from producing a quantity of 50 cheeseburgers per hour to 70 cheeseburgers per hour, the average variable cost of production is (Click to select) | and the average total cost of cheeseburger production is (Click to select)