Sheridan Diesel owns the Fredonia Barber Shop. He employs $7$ barbers and pays each a base rate of $$1,570$ per month. One of the barbers serves as the manager and receives an extra $$540$ per month. In addition to the base rate, each barber also receives a commission of $$5\mathrm{.}90$ per haircut.

Other costs are as follows.

$\backslash$table$[[$Advertising$,$$$310,$per month$],[$Rent$,$$$920,$per month$],[$Barber supplies,$$0\mathrm{.}44,$per haircut$],[$Utilities$,$$$180,$per month plus $$0\mathrm{.}36$ per haircut$],[$Magazines$,$$$20,$per month$]]$

Sheridan currently charges $$12\mathrm{.}70$ per haircut.

$($a$)$

Determine the variable costs per haircut and the total monthly fixed costs. $($Round variable costs to $2$ decimal places, eg$.2\mathrm{.}25.)$

Total variable cost per haircut $ $$

Total fixed

$