Answer:
There is some information missing, and when I looked for it I found similar questions but the demand was already given and the question was about Vincent's total daily income.
Passenger Price Daily demand
Adults $18 70
Children $10 25
Senior citizens $12 55
total 150
total revenue per day = ($18 x 70) + ($10 x 25) + ($12 x 55) = $1,260 + $250 + $660 = $2,170
total operating costs per day = (150 / 50) x $450 = $1,350
operating income per day = $2,170 - $1,350 = $820