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 $ 76,000 $ 35,200 $ 30,000 $ 42,000 Alternative R $ 76,080 $ 34,300 $ 34,300 $ 42,600 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? Supplies costs a Power costs a Inspection costs a Assembly costs b Differential cost