Schedule of Activity Costs Quality Control Activities Activity Cost Process audits $50,000 Training of machine operators 28,000 Processing returned products 19,000 Scrap processing (disposal) 25,000 Rework 8,000 Preventive maintenance 30,000 Product design Warranty work Finished goods inspection > From the provided schedule of activity costs, determine the appraisal costs. Oa. $50,000 46,000 12,000 23,000 Ob. $73,000 Oc. $104,000 Od. $23,000