Luke's Lubricants starts business on January 1 . The following operations data are available for January for the one lubricant it produces. Costs incurred in January follow. All production at Luke's is sold as it is produced (there are no finished goods inventories). Required: a. Compute cost of goods sold for January. (Do not round intermediate calculations.) b. What is the value of work-in-process inventory on January 31 ? (Do not round intermediate calculations.)