A group of 12 foreign officials rented a suite at the Grand Hyatt Hotel in San Francisco for $525.00 per night. They stayed for 6 nights. How much of a tip should the group leave the maid before they depart and what amount should each person pay in order to leave that tip?

Some professions that provide you with personalized service don't pay well and so they expect a tip - waiters and waitresses, cab drivers, tour guides, hotel bell hops (yes they do still exist in many places), hotel maids, valet attendants (they park your car for you), movers and barbers and hair dressers.  
Often, tips are based on percentages.