To find his hourly wage, we should first add the taxes to the pay
so,
672.55
99.60
+41.62
813.77
So he earned 813.77 for working 28 hours
To find out how much he earned for each hour
813.77 / 28 = 29.06
Mr. Amos's hourly wage is $29.06 or option C...
Hope this helps :)