4. Profit maximization in the cost-curve diagram The following graph plots daily cost curves for a firm operating in the competitive market for rompers. Hint: Once you have positioned the rectangle on the graph, select a point to observe its coordinates. PRICE (Dollars per romper 50 45 40 35 30 25 20 15 10 S D + 0 MC AIC AVC 2 4 G 8 10 12 14 16 QUANTITY (Thousands of rompers per day) 18 20 Profit or Loss

Principles of Microeconomics Name: Homework #3 Prof. R. Harris DUE: Wednesday, April 17, 2019 at the beginning of class - NO EXCEPTIONS. Please remember to show all work and please be neat. Please staple this if you print it on your own. 1. Consider the following table of numbers, which represents demand and cost conditions for a com firm. petitive TR 600 0 1 2 $o $400 600 $400 $240 600 $430 $670 $960 $1,350 $1,840 $2,440 $3,120 $3,910 $4,800 600 600 600 600 600 600 5 6 7 600 600 9 10 (a) Fill in the missing values (b) Use the information in the chart to determine what level of output the firm should produce. Explain your reasoning.

Suppose that the market for polos is a competitive market. The following graph shows the daily cost curves of a firm operating in this market. Esc 50 PRICE (Dollars per polo) 78°F Sunny 45 40 F1 35 30 25 20 15 10 5 0 + 0 + 2 F2 MC -0- + 4 ATC AVC 6 8 10 12 14 QUANTITY (Thousands of polos) F3 0+ F4 69 16 18 F5 20 a F6 i I F7 4- F8 Q+ H F9 F10 FO F11 F12 Fn Lock Ins

6. A-One bakery in Brampton sells 350 fruit cakes slices each month for $3.25 each. They are looking for help to come up with a strategy to increase revenue. A student from our school who works their part time conducts a survey. The results of the survey indicate that sales of the fruit cake slices would increase by 80 per month for each $0.10 decrease in price. c. Determine the marginal revenue from the sales of 200 slices of fruit cake. d. The cost of producing x fruit cake slices is C(x) = -0.0005x² + 1.5x + 300. Determine the marginal cost of producing 200 fruit cake slices.