costs.

$\backslash$table$[[$Month$,\backslash$table$[[$Total$],[$Maintenance Costs$]],\backslash$table$[[$Total$],[$Machine Hours$]]],[$January$,$$$2,735,3,620],[$February$,3,108,4,144],[$March$,3,730,6,216],[$April$,4,662,8,184],[$May$,3,315,5,180],[$June$,4,832,8,280]]$

$($a$1)$

Determine the unit variable costs using the high$-$low method for this mixed cost. $($Round answer to $2$ decimal places e$.$g$.2\mathrm{.}25.)$

Variable cost per machine hour $