1. The problem statement, all variables and given/known data A manufacturer produces DVD at $2 per each unit. The selling price is $5 each. 4000 units are soled per month. The manufacturer want to raise the price and estimates that for each $0.50 increases in price, 200 fewer DVDs will be sold each month. Relationship between DVD price and number sold is linear. Find P(x), the total profit in terms of x, the number of made and sold. 2. Relevant equations Equation? mx+b 3. The attempt at a solution The slope is -2, I think. And I am given point (3, 4000) the reason is that price per unit 5$ minus manufacturing price is 3. Am I doing right?