Sally Corporation is considering two alternatives that are code-named M and N. Costs associated with the alternatives are listed below: Alternative M Alternative N $43,000 $43,000 $26,000 $19,000 Supplies costs Assembly costs Power costs Inspection costs $53,000 $56,000 $26,000 $26,000 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? Show your work