< Schedule of Activity Costs Quality Control Activities Activity Cost Process audits Training of machine operators $50,700 27,900 Processing returned products 19,900 Scrap processing (disposal) 26,700 Rework 7,500 Preventative maintenance 27,300 Product design 41,300 Warranty work 7,700 Finished goods inspection 23,600 From the provided schedule of activity costs, determine the total activity cost. Oa. $104,800 Ob. $153,800 Oc. $232,600 Od. $281,446