Xerox standard accounting for the first one. (You will need to download the reports and keep them though, it won't do monthly/quarterly/yearly)
Print less for the 2nd one. Print duplex for another.
If you are looking to track the users but not use the printer itself, there are many options.
I would like to see how much prints are taken by individual Monthwise yearly quarterly in 7835i
also suggest me some usefull way how can i reduce papper cunsumption