The AAA Aquarium Co. sells aquariums for $\$ 20$ each. Fixed costs of production are $\$ 20 .$ The total variable costs are $\$ 20$ for one aquarium, $\$ 25$ for two units, $\$ 35$ for the three units, $\$ 50$ for four units, and S80 for five units. In the form of a table, calculate total revenue, marginal revenue, total cost, and marginal cost for each output level (one to five units). What is the profit-maximizing quantity of output? On one diagram, sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue and marginal cost curves.