This is for my economics class. Please help!

Old McDonald had a farm. Assuming that Old McDonald is buying and selling in both the input

and output markets in perfect competition, answer the following questions:

b. At what point will Freddie will be at the most efficient point of production? Why?

c. What is the optimum point of production? How do you prove it? What are the net revenues

at which profits are maximized?

d. If costs of production goes up, what choices does Old McDonald has? At what point will Old

McDonald will have to shut down (Poor guy)? Why (hint: use the shutdown rule for which

you will have to derive the average fixed and average variable cost from the information

provided).