Jan is proud of himself for creating his first financial bud…

Jan is proud of himself for creating his first financial budget. He is excited to watch his savings grow while he reduces his unnecessary spending. When calculating his income, Jan expects to bring home $180 a week by working 20 hours and making $9 an hour. When he receives his first paycheck, Jan is upset because he only made $145. What is the most likely reason for the difference between his expected income and his actual income?