Hightower Enterprises manages apartment buildings for various small investors. It spends a significant amount of time on two activities: maintenance and rent collection. Sort the following costs into maintenance and rent collection using M for maintenance and R for rent collection. If the resource seems shared, use an S. Finally, if you are unsure, use an O for overhead.

Lawn mowers ................................   Desks

Computers .....................................   Rakes

Rent collectors ..............................   Telephones

Trucks .............................................   Building

Maintenance supervisor ..............  Office manager

Electricity ......................................... Leaf blowers

Invoices ...........................................  Deposit slips

Maintenance crew ......................... Company president