A manufacturer of a particular item has monthly fixed costs of $600 and
variable costs of $25 per item, and it sells the items for $50 per item.
a. Write a function that models the monthly profit P from the production and
sale of x units of the item.
b. What is the profit if 180 items are produced and sold in 1 month?
c. At what rate does the profit grow as the number of items increases?