Solve the Problem $x$ Items Is Given By $P(x)=-x^{2}+12 x-33$ Find the Marginal Profit At Total

Multiple Choice

Solve the problem.
-Suppose that the total profit in hundreds of dollars from selling $x$ items is given by $P(x) =-x^{2}+12 x-33$ . Find the marginal profit at $x=6$ .

A) $\$ 300$ per item
B) $-\$ 1200$ per item
C) $\$ 200$ per item
D) $\$ 0$ per item