9. A firm has fixed costs of $60 and variable costs as indicated in the accompanying table. LO4 Complete the table and check your calculations by r eferringtoquestion3attheendo fChapter7.

a. Graph the ACF, ATC, and MC cuersv. Why does the AFC curve slope continuously downward? Why does the MC curve eventually slope upward? Why does the MC curve intersect the ATC curve at its minimum point?

b. Explain how the locationf oeach cuerv garphed in question 9a would be altered if (1) total fixed cost had been $100 rather than $60 and (2) total variable cost had been $10 less at each level of output.