Lisa is considering adding ferry services between June Island and Starfish Island. Lisa can rent ferries on a monthly basis at $3,200 per ferry, per month. Each ferry can accommodate 75 passengers, and can make 8 one-way trips a day, 30 days a month. Lisa decides to charge $6 per one-way ride.

Lisa has the following costs:

Ticket processing: $.50 per passenger

Taxes: $.80 per passenger

Fuel: $105.00 per one-way trip

Crew Salaries: $60.00 per one-way trip

Ferry Cleaning: $25.00 per one-way trip

Shore costs vary with the number of ferries in the following manner: