JWU Email 3 (74) The Less I Kno.. 2 Macro Final - Econ... https://www2.cons... We Wix Website Editor... E Calculator A normal job-order costing system is a system that determines unit cost by using: Oa. actual costs for direct materials and direct labor and estimated costs for overhead. Ob. estimated costs for direct materials, direct labor, and overhead. Oc. actual costs for direct materials and estimated costs for direct labor and overhead. Od. actual costs for direct materials and overhead and estimated costs for direct labor