Answer:
1. 20 units
2. $600
Explanation:
1. [tex]C = 200 + 2q^{2}[/tex]
MC = 4q
Price, P = $80
For maximizing profits,
Marginal cost = Â Price of the commodity
4q = 80
q = 20 units
[tex]C = 200 + 2q^{2}[/tex]
[tex]C = 200 + 2(20)^{2}[/tex]
     = 200 + 800
     = 1,000
2. Profit = Total revenue - Total cost
       = (Price × Quantity) - TC
       = (80 × 20) - $1,000
       = $1,600 - $1,000
       = $600
3. We know that the firm in the short run will be produce at a point where total revenue is greater than the total variable cost
Average variable cost = variable cost ÷ quantity
               [tex]=\frac{2Q^{2}}{Q}[/tex]
                   = 2Q
MC = 4Q
Here, Â MC is greater than AVC at any given point.
so in the short run firm will producing short run positive profit.