May I please get some help

Suppose that the monthly cost, in dollars, of producing x chairs is C(x) = 0.002x"+ 0.07x + 19x + 600, and currently 25 chairs are produced monthly a) What is the current monthly cost? b)What is the marginal cost when x = 25? c)Use the result from part (b) to estimate the monthly cost of increasing production to 27 chairs per month. d)What would be the actual additional monthly cost of increasing production to 27 chairs monthly? a) The current monthly cost is $ 1150 (Round to the nearest cent as needed.) b) The marginal cost when x = 25 is $ per item (Round to the nearest cent as needed.)