Costs associated with two alternatives, code-named Q and R, being considered by Albiston Corporation are listed below: Supplies costs Power costs Inspection costs Assembly costs Alternative $90,000 $48,000 $45,000 $54,880 Alternative R $90,000 $46,900 $46.900 $54, eee Required: a. Which costs are relevant and which are not relevant in the choice between these two alternatives? b. What is the differential cost between the two alternatives? a Supplies costs Power costs Inspection costs Assembly costs b. Differential cost