We know that:
Base pay = $8.18 per hour.
Overtime pay = $8.18 + $2.18 = $10.36 per hour.
4 employees working for 10 hours at base pay and 3 hours at overtime pay, each, gives us an equation:
[tex]total = 4[10(8.18) + 3(10.36)]\\total = 451.52[/tex]
They made a combined total of $451.52 at the fair.