Exercise $9-7($Algo$)$ Flexible Budgets and Activity Variances $[$LO$9-1,$ LO$9-2]$

Jake's Roof Repair has provided the following data concerning its costs:

$\backslash$table$[[,\backslash$table$[[$Fixed Cost$],[$per Month$]],\backslash$table$[[$Cost per$],[$Repair$-$Hour$]]],[$Wages and salaries,$$20,700,$$$15\mathrm{.}00$