A worker has a base pay of $20 per hour, gets $3 more per hour after 8 hours, and gets $4 more per hour (from base pay) after 13 hours. How much would he make in a 15 hour day?

The 7th grade has collected $200 for a field trip that would cost $600. the teachers decided to ask $50 from additional students to cover the cost. how mny students must pay to cover the cost ? a 16studentsb 80studentsc 160studentsd 8students show work