Rachael's Restaurant, a fast$-$food restaurant company, operates a chain of restaurants across the nation. Each restaurant employs eight people; one is a manager paid a salary plus a bonus equal to $4$ percent of sales. Other employees, two cooks, one dishwasher, and four servers, are paid salaries. Each manager is budgeted $$3,000$ per month for advertising costs.

Required

Classify each of the following costs incurred by Rachael's Restaurant as fixed, variable, or mixed:

$\backslash$table$[[$a$.$ Advertising costs relative to the number of customers for a particular restaurant.$],[$b$.$ Rental costs relative to the number of restaurants.$],[$c$.$ Cooks' salaries at a particular location relative to the number of customers.$],[$d$.$ Cost of supplies $($cups$,$ plates, spoons, etc.$)$ relative to the number of customers.$],[$e$.$ Manager's compensation relative to the number of customers.$],[$f$.$ Servers' salaries relative to the number of restaurants.$]]$