8. Suppose that the monthly cost, in dollars, of producing x chairs is C(x)=0.006x3+0.07x2+15x+700, and currently 70 chairs are produced monthly. a) What is the current monthly cost? What is the marginal cost when x=70? Use the result from part (b) to estimate the monthly cost of increasing production to 72 chairs per month. d) What would be the actual additional monthly cost of increasing production to 72 chairs monthly? a) The current monthly cost is Buy Guire b) The marginal cost when x=70 is c) The monthly cost in increasing production to 72 is d) The actual additional monthly cost of increasing production to 72 is