The total revenue function for a product is given by
R=655x
dollars, and the total cost function for this same product is given by
C=19,250+70x+x2,
where C is measured in dollars. For both functions, the input x is the number of units produced and sold.
a. Form the profit function for this product from the two given functions.
b. What is the profit when
25
units are produced and sold?
c. What is the profit when
43
units are produced and sold?
d. How many units must be sold to break even on this product?
a. Write the profit function.
P(x)=
(Simplify your answer.)
Answer
a)
C(x) = 19,250 + 70x + x2
R(x) = 655x
P(x) = R(x) - C(x) [Profit = Revenue - Cost]
P(x) = 655x - (19,250 + 70x + x²)
P(x) = 655x - 19,250 - 70x - x²
P(x) = 585x - 19,250 - x²
So, Profit Function is P(x) = 585x - 19,250 - x²
b)
Profit when 25 units are produced and sold will be P(25)
P(x) = 585x - 19,250 - x²
P(25) = (585*25) - 19,250 - (25)²
P(25) = 14,625 - 19,250 - 625
P(25) = - $5,250
= - $5,250 ( loss)
So, when 25 units are Sold there will be a loss of $5,250
c)
Profit when 43 units are produced and sold will be P(43)
P(x) = 585x - 19,250 - x²
P(43) = (585*43) - 19,250 - (43)²
P(43) = 25,155 - 19,250 - 1,849
P(43) = $4,056
So, when 43 units are sold there will be a profit of $4,056
d)
Break even point
At break even point there is no profit or loss. At break even point Profit = 0.
So, P(x) = 0, where x is the number of units sold
So,
585x - 19,250 - x² = 0
x² - 585x + 19,250 = 0
Solving the equation using middle term split
x² - 550x - 35x + 19,250 = 0
x(x-550) - 35 (x-550) = 0
(x-35) (x-550) = 0
So, x = 35 or x = 550
Solving P(35)
P(35) = (585*35) - 19,250 - (35)²
P(35) = 20,475 - 19,250 - 1,225
P(35) = 0
Solving P(550)
P(550) = (585*550) - 19,250 - (550)²
P(550) = 321,750 - 19,250 - 302,500
P(550) = 0
So, the company breaks even at 35 units as well as at 550 units.
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