Jessica’s parents own a restaurant. During holidays, the restaurant serves large groups of people. At these times, Jessica helps her parents by serving food and refilling drinks. She makes $4.50 per hour and 10% of a $140 dollar tip for each group that is served. Jessica receives $25.25 at the end of a night when one group is served. Leth represent the number of hours Jessica worked. Write an equation that could be used to determine how many hours Jessica worked that night.