Answer:
As Boing is much better in the cost per seat It will purchase from Boing and only to fullfil the requirement
1 airbus 320 seat $ 200
18 boing 4500 seat $ 2,250
2 loockheed 550 seat $ 400
Total 5,370 seat $ 2, 850
Explanation:
Airbus 320 seat $ 200M
Boeing 250 seat $ 125 M
Lockheed 275 seat $ 200 M
We need to get 4,480 seats with a budget of 2,900 millions plus the composition requirement of twice as many Lockheed as Airbus:
Those we will purchase an Airbus and two Lockheed to get the requirement of twice as many Lockheed as Airbus
The rest of the budget will be expended on Boeing