Amy earns $500 a week at her job when she works 40 hours. when she works more than 40 hours a
week, she calculates her gross pay in dollars, g, using the equation shown below.
g= 16.50(h-40) + 500
where h represents the total number of hours worked.
if her gross pay one week was $648.50, what was the total number of hours she worked that week?