The total profit (in dollars) from the sale of x toy trucks is given by P(x)=60 18x0.02x2. (a) Find the marginal profit for the 401st truck, that is, compute P(400) . (b) Does it make financial sense to sell more than 400 trucks? Why or why not? (c) Find the marginal profit for the 451st truck, that is, compute P(450) . (d) Does it make financial sense to sell more than 450 trucks? Why or why not