How much should it cost for a plumber to snake a drain?

My mother just had a plumber come snake the tub train in the bathroom. He got the job done in literally 5 min, pulled out the hair that was clogging the drain and was done. He charged her 120.00 for the job and I think thats outrageous being that my moms been going to him for years for everything. What ya think? Too much or am I just cheap? lol