The figure shows the graphs of the cost and revenue functions for a company that manufactures and sells external hard drives. The solid line represents the revenue function, R(x)=55x; the dashed line represents the cost function, C(x)=5000+20x. a. Use the formulas to write the company's profit function, P, from producing and selling x hard drives. b. Find the company's profit if 20,000 hard drives are produced and sold. a. The company's profit function is P(x)= (Simplify your answer.) b. The company's profit from producing and selling 20,000 hard drives is $ (Simplify your answer.)