Maximum profit. A chain store manager has been told by the main office that daily profit, P, is related to the number of clerks working that day, x, according to the function P = −25x2 + 300x. What number of clerks will maximize the profit, and what is
the maximum possible profit? Step by step answers please.

This is the equation of a parabola that opens downwards (because the coefficient of x

^{2}is negative) so the maximum value of P will be found at the parabola's vertex.The x-coordinate of the vertex is given by:
-b

2a

Your equation is already in the standard form: (a = -25, b = 300, c = 0) so we can find the x-coordinate at which P will be the maximum.

- 300 =
-300 = 6 So six clerks will maximize the profit.

2(-25) -50

To find the maximum profit, plug 6 into the equation for X

P = -25 (6)

^{2}+ 300(6) = -25 (36) + 1800

= -900 + 1800

= 900 this is the maximum profit