10. A firm's product sells for $2 per unit in a highly competitive market.The firm produces output using capital (which it rents at $75 per hour) and labor (which is paid a wage of $15 per hour under a contract for 20 hours of labor services).Complete the following table and use the information to answer the questions that follow.

a.What are the firm's fixed costs?

b.What is the variable cost of producing 400 units of output?

c.How many units of the variable input should be used to maximize the profits this firm can earn?

d.What are the maximum profits this firm can earn?

e.Over what range of the variable input do decreasing (marginal) returns exist?

f.Over what range of the variable input do negative (marginal) returns exist?