Earnings per hour: $13.75
Tuesday = 8 am to 2 pm = 6 hours
Thursday= 8 am to 1 pm = 5 hours
Friday = 10:00 am to 12:15 pm = 2.15 hours
Add all the hours:
6+5+2.15 = 13.15 hours
Multiply by the amount she earns per hour:
hours x earnings per hour = 13.15 x 13.75= $180.81
Gross pay $180.81