General Electric is planning to produce part A which is currently purchasing from Adm Tronics for $7 per unit. General Electric estimates that if it chooses to manufacture part A, it will cost $25000 to set up the process and then $3.73 per unit for labor and materials. At what volume would these options cost General Electric the same amount of money? (Solve the problem using Excel Goal-Seek tool) Please show step by step for dummies to include goal seek.