I've forgotten most of what I've learned about quadratics, and I need someone to help me with the following problem and its graph.

The graph below shows the number of people who will buy a product at a given price (sorry about the dollar signs):

**A.** How many people will buy the product when the price is $10?

**B.** If you want 60 people to buy the product, how much should you charge for it?

**C.** How much money will this generate for the company selling the product?

**D.** From the information provided in the graph, create a new graph of the amount of money the sales of the product will generate for each selling price from 0 to 23 dollars.