calculus math roland boat tours

Question

Roland's boat tours sells deluxe and economy seats for each tour it conducts. in order to complete a tour, at least 1 economy seats must be sold and at least 6 deluxe seats must be sold. the maximum number of passengers allowed on each boat is 30 Roland's boat tours makes $40 profit for each economy seat sold and $35 profit for each deluxe seat sold. what is the maximum profit from one tour? I need to show how to get answer.

Answer 1

1 economy = $40

6 deluxe = $210

23 seats remain. Should they be the ones that make $40 or the ones that make $35?