D Question 3 A firm's average total cost is $60, its average variable cost is $30, and its total fixed cost is $600. Its output is O 20 units. 30 units. 40 units. 50 units.Question 4 1 pts MC ATCAVC Cost (dollars per gallon) O 10 20 30 40 50 60 70 80 90 100 Quantity (gallons of ice cream per hour) Some of the cost curves for Ike's Ice Cream Kitchen are given in the above figure. At which of the following levels of output will AFC be the lowest? at 0 gallons at 10 gallons O at 40 gallons at 70 gallons