You are able to get three summer jobs to sabe for future college expenses. in your job as a cashier, your work twenty hours per week and earn $6.50 per hour. your second and third jobs are both at local hospital. there yu can earn $8.50 per hour as a payroll clerck and $6.00 per hour as an aide. you always work ten hours fewer per week as an aide than you do as the payroll clerk. your total weekly salary depends on the number of hours that you work at each job determine the independent and dependent variables for this situation