Posted by **Mary** on Sunday, December 14, 2008 at 11:28pm.

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

How many units must be sold to produce a revenue of $500?

- math -
**Leo**, Sunday, December 14, 2008 at 11:30pm
You will need to solve for x in the following equation:

500 = x(20-0.2x)

- math -
**s**, Sunday, December 14, 2008 at 11:33pm
factor it out

500 = 20x -0.2x^2

0.2x^2 - 20x + 500 = 0

divide the whole equation by 0.2

x^2 - 100x + 2500 = 0

(x-50)^2

R=50

- math -
**Mary**, Sunday, December 14, 2008 at 11:33pm
i got 500=20x-0.2x^2

whats the next step?

=\

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