A firms production function is Q = 0 + 6L + 5L² - .2L³ + 3K + 2K²- .2K³. The firm is currently producing output with a fixed amount of capital K =10. It hires labor with a wage rate of P_L = Wage = 120. Suppose the firm is currently employing 10 units of L along with 10 units of K. The marginal cost of production is _____. Conduct an analysis using an Excel Spreadsheet and changing Labor by 1, 2, 3, etc., that is, use integer values of L only to solve this problem.

	A.	2.56.
	B.	3.65.
	C.	4.84.
	D.	7.14.