Algebra
posted by jessica .
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 breakeven 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=2.25x7000, and you can solve for x.
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