Word problem in units

[Kyle Concannon]

Please help me set up this problem so I can answer it. I know the answer is 50 units, but how do I find it?

The revenue R from selling x units of a certain product is given by R=x(20-0.2x).

Find the number of units that must be sold to produce a revenue of $500.

 

[stapel]

Plug in "500" for "R". Solve the resulting quadratic equation.

(A good first step would be to multiply out the right-hand side, and then move the variable terms over to the left-hand side. Then maybe apply the Quadratic Formula.)

Eliz.