APPLICATION: A local outlet store charges $2.00 for a pack of four AA batteries. On an average day, 200 packs are sold. A survey indicates that sales will decrease by 5 packs per day for each $0.10 increase in price.

a. Complete the table above based on the results of the survey.
b. Calculate the first and second differences for the revenue.
c. Let x represent the selling price in dollars, and let y represent the revenue in dollars. Write a function that describes the relationship between the revenue and the selling price.
d. Graph your function and find the maximum revenue. What selling price provides maximum revenue?

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2.00 2.10 2.20 2.30 2.40 Selling price (S) Number sold Revenue ($) 200 | 400