A particular computing company finds that its weekly profit, in dollars, from the production and sale of x laptop computers is P(x) = -0.002x3 0.2x + 500x - 700. Currently the company builds and sells 9 laptops weekly. a) What is the current weekly profit? b) How much profit would be lost if production and sales dropped to 8 laptops weekly? c) What is the marginal profit when x=9? d) Use the answer from part (a) and (c) to estimate the profit resulting from the production and sale of 10 laptops weekly