The marginal profit in dollars on Brie cheese sold at a cheese store is given by P(x)=x(80x^2+90x), where x is the amount of cheese sold, in hundreds of pounds. The "profit" is $50 when no cheese is sold.

a. Find the profit function.

b.

Find the profit from selling 300 pounds of Brie cheese.

a. Find the profit function. P(x)=___

b.

Find the profit from selling 300 pounds of Brie cheese. ____