Shade Company adopted a standard cost system several years ago. The standard costs for direct labor and direct materials for its single product are as follows: Materials (5 kilograms $12 per kilogram) = $60 per unit; direct labor (3.5 hours per unit $20 per hour) = $70 per unit. All materials are issued at the beginning of processing. The operating data shown below were taken from the records for December: In-process beginning inventory In-process ending inventory-80% complete as to labor Units completed during the period Budgeted output Purchases of materials (in kilograms) Total actual direct labor cost incurred Direct labor hours worked (AQ) Materials purchase-price variance Increase in materials inventory in December None 1,030 units 6,840 units 7,410 units 43,500 $ 540,464 27,200 hours $ 4,785 favorable 3,300 kilograms The direct labor efficiency variance for December was