Each year, a cyber café charges its customers a base rate of $25, with an additional $0.30 per visit for the first 50 visits, and $0.10 for every visit after that. How much does the cyber café charge a customer for a year in which 72 visits are made?

Translate the information into arithmetic. The café charges $25 + $0.30 (first 50) + $0.10(x) (x is additional visits after 50). For 72 visits there are 50 visits with an additional 22 visits.
=$25+$0.30(50)+$0.10(22)
=$25+$15+$2.20
=$42.20.