0

# Maximum profit.

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.

### 1 Answer by Expert Tutors

Trish H. | Certified Math Teacher- Individualized Instruction and Test PrepCertified Math Teacher- Individualized I...
5.0 5.0 (338 lesson ratings) (338)
0
This is the equation of a parabola that opens downwards (because the coefficient of x2 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