SOLUTION: A video store sells about 100 DVDs a week at a price of $21 each. The owner estimates that for each $3 decrease in price, about 20 more DVDs will be sold each week. How can the ow

Question 599430: A video store sells about 100 DVDs a week at a price of $21 each. The owner estimates that for each $3 decrease in price, about 20 more DVDs will be sold each week. How can the owner maximize weekly revenue?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the number of $3 decreases in price
Let = weekly revenue
given:

This parabola has a maximum since the
coefficient of the term is minus
The maximum is at when
the equation has the form

When ,

The owner can maximize revenue by
decreasing the price once by $3/CD
check:

-------------

OK

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