can you explain the B and C please ?

Kopy Kat Photocopy Service processes 1,000,000 photocopies per month at its midtown service center. Approximately 60 percent of the photocopies require collating. Collating is currently performed by high school and college students who are paid $7.50 per hour. Each student collates an average of 5,000 copies per hour. Managernent is contemplating the lease of an automatic collating machine that has a monthly capacity of 5,000,000 photocopies, with lease and operating costs totaling $1,450, plus $0.05 per 1,000 units collated. Required: a. Determine the total costs of collating 500,000 and 1,500,000 per month: 1. With student help. 2. With the collating machine. b. Determine the monthly volume at which the automatic process becomes preferable to the manual process. c. Should Kopy Kat lease the automatic collating machine at this time