Mackinaw Inc. processes a base chemical into plastic. Standard costs and actual costs for direct materials, direct labor, and factory overhead incurred for the manufacture of 6,800 units of product were as follows: Standard Costs Actual Costs Direct materials 8,800 lb. at $6.00 8,700 lb. at $5.80 Direct labor 1,700 hrs. at $18.00 1,740 hrs. at $18.20 Factory overhead Rates per direct labor hr., based on 100% of normal capacity of 1,770 direct labor hrs.: Variable cost, $3.90 $6,560 variable cost Fixed cost, $6.20 $10,974 fixed cost Each unit requires 0.25 hour of direct labor. Required: a. Determine the direct materials price variance, direct materials quantity variance, and total direct materials cost variance. Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number. Price variance $ Quantity variance $ Total direct materials cost variance $ b. Determine the direct labor rate variance, direct labor time variance, and total direct labor cost variance. Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number. Rate variance $ Time variance $ Total direct labor cost variance $ c. Determine variable factory overhead controllable variance, the fixed factory overhead volume variance, and total factory overhead cost variance. Enter a favorable variance as a negative number using a minus sign and an unfavorable variance as a positive number. Variable factory overhead controllable variance $ Fixed factory overhead volume variance $ Total factory overhead cost variance $