Alyeski Tours operates day tours of coastal glaciers in Alaska on its tour boat the Blue Glacier. Management has identified two cost driversthe number of cruises and the number of passengersthat it uses in its budgeting and performance reports. The company publishes a schedule of day cruises that it may supplement with special sailings if there is sufficient demand. Up to 90 passengers can be accommodated on the tour boat. Data concerning the companys cost formulas appear below: