A store artisan baguettes for $4. At this price, the store sells approximately 20 baguettes a day. The owner decides to raise the price of baguettes knowing that
each price increase by $1 will result in 2 less baguettes being sold. The quadratic
relation, R= -22 +12x +80 models the situation where R is the revenue/sales in
dollars from baguette sales and x is the price increase in dollars.
What should the price be for each baguette in order to maximize revenue?