Maximizing profit. The market research department for a drugstore chain chose two summer resort areas to test market a new sunscreen lotion packaged in 4 -ounce plastic bottles. After a summer of varying the selling price and recording the monthly demand, the research department arrived at the following demand table, where y

is the number of bottles purchased per month (in thousands) at x

dollars per bottle:

A) Use the method of least squares to find a demand equation.

(B) If each bottle of sunscreen costs the drugstore chain

how should the sunscreen be priced to achieve a maximun monthly profit?