Tiny Toys Is Going to Produce a Toy Race Car $\$ 378$

Tiny Toys is going to produce a toy race car version of the new Volkswagen Bug. The overhead for the project is $\$ 378$ . Each toy Bug costs $\$ 1.25$ to make.
(a) Write a cost function $C$ , where $x$ represents the number of toy Bugs manufactured.
(b) Find the revenue function $R$ , if each toy Bug in part (a) sells for $\$ 3.00$ .
(c) Give the profit function $P$ .
(d) How many toy Bugs must be produced and sold before Tiny Toys earns a profit?
(e) Support the results of part (d) graphically.