Question 1122122
If he works 40 hours a week it is 2080 hours a year.  That would be 2080*9 +$55*52 or $21580.
If the formula is 52(9n+55) and n=40, this is 52(415)=$21580
Likely, n had to be exactly defined.
Or, one could have dealt with the bonus separately at $2860.
Then the expression would have been amount=52n+2860, where n is the number of hours worked per week.