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# Problems

39.

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 $80 for five units. In the form of a table, calculate total revenue, marginal revenue, total cost, and marginal cost for each output level, with a range of one to five units. On one diagram, sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue and marginal cost curves. What is the profit-maximizing quantity of output? 40. Perfectly competitive firm Doggies Paradise Inc. sells winter coats for dogs. Dog coats sell for$72 each. The fixed costs of production are $100. The total variable costs are$64 for one unit, $84 for two units,$114 for three units, $184 for four units, and$270 for five units. In the form of a table, calculate total revenue, marginal revenue, total cost, and marginal cost for each output level, with a range of one to five units. On one diagram, sketch the total revenue and total cost curves. On another diagram, sketch the marginal revenue and marginal cost curves. What is the profit-maximizing quantity of output?

41.

A computer company produces affordable, easy-to-use home computer systems and has fixed costs of $250. The marginal cost of producing computers is$700 for the first computer, $250 for the second,$300 for the third, $350 for the fourth,$400 for the fifth, $450 for the sixth, and$500 for the seventh.

1. Create a table that shows the company’s output, total cost, marginal cost, average cost, variable cost, and average variable cost.
2. At what price is the zero-profit point? At what price is the shutdown point?
3. If the company sells the computers for $500, is it making a profit or a loss? How big is the profit or loss? Sketch a graph with average cost, marginal cost, and average variable cost curves to illustrate your answer and show the profit or loss. 4. If the firm sells the computers for$300, is it making a profit or a loss? How big is the profit or loss? Sketch a graph with average cost, marginal cost, and average variable cost curves to illustrate your answer and show the profit or loss.