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Answer:
4 seats economic, 2 seats first class, 3 seats business class, 1 seat premium class
Step-by-step explanation:
4 \times economy class = 400$ +
2 \times first class = 300$ +
3 \times bussines class = 600$ +
1 \times premium class = 300$
= 1600$
This is the way to spend the least money if everyone is seated on one seat.