Multiply her pay per hour times number of hours worked.
For a normal 40 hour week, she is paid 16.34 per hour:
16.34 x 40 = 653.60
Overtime is any hours over 40, so if she works 60 hours, she would have 20 hours of over time.
Multiply 20 hours by her overtime rate:
20 x 24.51 = 490.20
Now add this to her normal 40 hour pay:
490.20 + 653.60 = 1143.80
So her range is from 40 hours: 653.60 to 60 hours: 1143.80
The answer would be A