Sung lee and lia both work eight hours a day. total travel time to and from work

The company should print the 3,000 units of Tennessee  as they will yield a gain for 3,000 dollars.

Because it faces economies of scale it should sale for as much as it can from a given pattern

Explanation:

Profit: revenue - variable cost - fixed cost

Profit =   15*Q - 8*Q - 18,000

Profit =          7Q- 18,000

3,000 Tennessee shirts x $7 contribution per shirt - 18,000 setup cost

profit: 21,000 - 18,000 = 3,000

Profit maximization: Marginal revenue = marginal cost

Total Revenue: 15 x Q

dTR' /dQ = 15

dTR''/dQ = 0

cost function: 18,000 + 7Q

dC'/dQ = 7

dC''/dQ = 0

Sport Tee faces a economie of scale their cost do not increase over time. Sport Tee should sale as many shirt as it possible can