Algebra

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An inventor of a new product believes that the cost of producing the product is given by the function C(x) = 1.75x + 7000.

If the inventor 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?

I know how to work a and b, but how do I work c?

break even is when Profit is zero. Revenue is equal to costs at that point.

So if Profit is zero, then 0=2.25x-7000, and you can solve for x.

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