Alyeski Tours operates day tours of coastal glaciers in Alaska on its tour boat the Blue Glacier. Management identified two cost drivers for budgeting purposes$-$the number of cruises and the number of passengers. The company publishes a schedule of day cruises that it may supplement with special sailings if there is sufficient demand. Up to $87$ passengers can be accommodated on the tour boat. Data concerning the company's cost formulas appear below:

$\backslash$table$[[,\backslash$table$[[$Fixed$],[$Cost per$],[$Month$]],$Cruise per,Cost per$],[$Vessel operating costs,$$6,700,$$$475\mathrm{.}00,$$$3\mathrm{.}20$