Neptune Company has developed a small inflatable toy that it is anxious to introduce to its customers. The company's Marketing Department estimates that demand for the new toy will range between $15,000$ units and $35,000$ units per month. The new toy will sell for $$3$ per unit. Enough capacity exists in the company's plant to produce $18,000$ units of the toy each month. Variable expenses to manufacture and sell one unit would be $$1\mathrm{.}00,$ and incremental fixed expenses associated with the toy would total $$22,000$ per month.

Neptune has also identified an outside supplier who could produce the toy for a price of $$1\mathrm{.}75$ per unit plus a fixed fee of $$15,000$ per month for any production volume up to $20,000$ units. For a production volume between $20,001$ and $40,000$ units the fixed fee would increase to a total of $$30,000$ per month.