algebra
posted by Anonymous .
Our hardware store buys tools for $15 each, marks them up and sells them for $30. Their monthly expenses (fixed costs) are $10,000.
a. What is the cost function?
b. What is the revenue?
c. How many units must be sold for the company to get a profit?

C(x) = 10000 + 15x
R(x) = 30x
set R >= C and solve for x