Answer:
$4000 is the correct answer to the given question .
Explanation:
The marginal cost with compare to the labor can be written as
[tex]MC\ = \frac{dQ}{dL} \\MC =\frac{d\ ( 2(K)1/2(L)1/2\ )}{dL} \\\\MC=\frac{\sqrt{K} }{\sqrt{L} }[/tex]
Here K=9 units putting this value in the previous equation we get
[tex]MC\ = \frac{\sqrt{9} }{\sqrt{L} }[/tex]
[tex]MC=\frac{3}{\sqrt{L} }[/tex]
We can find the value of labor by the given formula that are given below
[tex]V *MC=\ W\\400\ *\frac{3}{\sqrt{L} }\ =120\\ L=10[/tex]
From the given question that are mention in question
Q = 2(K)1/2(L)1/2
Putting the value of K and L in the given equation we get
[tex]Q\ =2 * \sqrt{9} \ * \sqrt{100} \\Q\ = 60[/tex]
So profit maximizing output is =$60 chairs as the chairs can be sold for the $400 each so = $60 * $400 *10=$24000 chairs
As the competitive wage of $120 for 100 units as well as the total of $8,000 on the 9 units of capital equipment
=$20000
Therefore profit-maximizing level of output =$24000-$20000=$4000