James took his date to a really fancy restaurant. He was shocked when he got his bill for $133.47, especially since the service wasn’t even all that good. The tax on the bill was for $12.02. James decided to only leave a 15% tip. How much of a tip did James leave?

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.