Consider a small firm that is producing winter jackets. It can lease an additional sewing machine for one month for $$2400.$ With this additional machine, the firm can produce an additional $4$ jackets during that time period that it sells for $$550$ each. Hiring the marginal machine adds to the firm's profit and so it should the machine.

Select one:

a$.$ $$200$; lease

b$.-$$$200$; not lease

c$.$ $$2400$; lease

d$.$ $$0$; be indifferent as to whether to lease

e$.-$$$2400$; not lease