Break$-$even sales and sales mix for a service company

operating statistics:

Fuel

Flight crew salaries

Airplane depreciation

Variable cost per passenger$-$business class

Variable cost per passenger$-$economy class

Round$-$trip ticket price$-$business class

Round$-$trip ticket price$-$economy class

$$9,146$

$7,006$

$3,308$

$60$

$50$

$530$

$280$

It is assumed that the fuel, crew salaries, and airplane depreciation are fixed, regardless of the number of seats sold for the round$-$trip flight.

and $80\%$ economy class tickets.

Total number of seats at break$-$even

seats

b$.$ How many business class and economy class seats would be sold at the break$-$even point?

Business class seats at break$-$even

seats

Economy class seats at break$-$even

seats