Business and finance.?

Question: If the inventor in exercise 53 charges $4 per unit, then her
profit for producing and selling x units is given by the function
P(x) = 2.25x - 7000
(a) What is her profit if she sells 2000 units?
(b) What is her profit if she sells 5000 units?
(c) What is the break-even point for sales?

Answer:
(a)
Loss of $2500

(b)
Profit of $4250

(c)
Break even point is selling 3,111 units.

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