QUICKKK PLEASE SOLVE AND EXPLAIN WILL GIVE 50POINTS ILL REPORT YOU IF YOU JUST TAKE THEM

A restaurant manager can spend at most $400 a day for operating costs and payroll. It costs $80 each day to operate the restaurant and $40 dollars a day for each employee. Use the following inequality to determine how many employees the manager can afford for the day, at most:

40x + 80 ≤ 400
a)x ≥ 8
b)x ≥ 12
c)x ≤ 8
d)x ≤ 12