While putting together the WBS dictionary for the Road Re-pavement project roadway preparation work package, Jim Gillet, the site prep lead, notes that they will need a jackhammer to remove the old road surface. He notices he can purchase a jack hammer at Saul's Way Cool Equipment Supply Company for $1,500 and he knows from experience that maintaining the jackhammer will cost $18 a day. He also checks Acme Tool Rental and finds he can rent one for $200 a day with maintenance included. At what point does it make more sense to purchase a jackhammer