The Profit P (In Hundreds of Dollars) That a Company $P = 230 + 30 x - 0.5 x ^ { 2 }$

Multiple Choice

The profit P (in hundreds of dollars) that a company makes depends on the amount x (in hundreds of dollars) the company spends on advertising according to the model $P = 230 + 30 x - 0.5 x ^ { 2 }$
What expenditure for advertising will yield a maximum profit?

A) 30
B) 0.5
C) 230
D) 15
E) 115