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/kilogram) = $60/unit; direct labor (3.5 hours/unit * $20/hour) = $70/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 1,120 units 7,020 units 7,680 units 48,000 $555,818 28,100 hours $ 9,600 favorable 5,550 kilograms The actual total cost of direct materials used in production during December (to the nearest dollar) was: $502,180. $519,448. $503,986. $499,116. $500,910