Prepare a flexible budget for activity levels of 510, 600, and 670 direct labor hours. (List variable costs before fixed costs.) Sheridan is in the dog-grooming business. Its operating costs are described by the following formulas: Groomingsupplies(variable)Directlabor(variable)Overhead(mixed)y=$0+$4xy=$0+$14xy=$9,100+$1x Milo, the owner, has determined that direct labor is the cost driver for all three categories of costs. Activity Level Direct Labor Direct Labor Hours Fixed Costs Grooming Supplies Overhead Total Costs Total Fixed Costs Total Variable Costs Variable Costs