The function P(x) = –0.015x 2 + 1.2x – 11.5 gives the profit, in thousands of dollars, when
a company sells a new product at x dollars per unit. Which of the following statements best
interprets the average rate of change of this function from x = 50 to x = 55?
A. The profit increases by $375 for every $1 increase in the selling price.
B. The profit decreases by $375 for every $1 increase in the selling price.
C. The profit increases by $1875 for every $1 increase in the selling price.
D. The profit decreases by $1875 for every $1 increase in the selling price.