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 $68,000 $31,500 $22,000 $36,000 Alternative R $68,000 $30,300 $30,300 $36,000 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