I need to know how to do these problems. I'm studying for a test! There will be

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club penguinn

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problems like it on the test!!? 1. An electronics store sells about 70 of a new model of digital camera per month at a price of $320 each. For each $20 decrease in price, about 5 more cameras per month are sold. Write a function that models the situation. Then tell how the store can maximize monthly revenue from sales of the camera.

2. An online music store sells about 4000 songs each day when it charges $1 per song. For each $.05 increase in price, about 80 fewer songs per day are sold. Find how the store can maximize daily revenue.


Please try to explain how the problem was done!!!
THANKSS! :)
 
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