Question 13. 13. A mattress manufacturer has provided the following cost data. The cost of fabric, foam, springs, and lumber is $68,000. The cost of indirect materials is $21,000. Labor cost of assembly workers is $52,000 and for production supervisors is $14,000. How much indirect cost is included in the above costs? (Points : 3) $21,000 $35,000 $89,000 $103,000