Could use some help working through the following problem, any help would be appreciated: 1.The manager of a national retailing outlet recently hired...

Could use some help working through the following problem, any help would be appreciated:

1.      The manager of a national retailing outlet recently hired an economist to estimate the firm's production function. Based on the economist's report, the manager now knows that the firm's production function is given by Q = K1/2L1/2.

a.      Assuming capital is fixed at 4 units, calculate the average product of labor when 9 units of labor are utilized.

b.      Assuming capital is fixed at 4 units, calculate the marginal product of labor when 9 units of labor are utilized.

c.      Assume that capital is fixed at 4 units and that the firm can hire labor at a wage of $10 an hour and output can be sold at a price of $100 per unit. Determine the profit-maximizing levels of labor and output.