1. A company determines that the profit from selling x units of an item is given by π(x) = 0.0003x² + 5x. Find the marginal profit for 40 units sold and interpret its meaning in the context of the problem.
2. A small business has 200 scooters to rent If x scooter are rented, the monthly profit is π(x) = −5x² + 1800x − 60000. How many scooters need to be rented to maximize profit?
3. A company sells 1500 items per month at a price of $15 each. It is predicted that the monthly sales will increase by 125 items for each $0.30 reduction in price. Find the demand function. How much units much they sells to maximize revenue? What is the maximum revenue?
4. If the cost function is C(q) = 3q² + 5q + 12, what is the minimum average cost?