hey i need someone to help me with this equation its confusing

Answer:
$4
Step-by-step explanation:
Sylvia: 35.50 + 6*16 = 131.50
Raul: 15.50 + 6*20 = 135.50
135.50 - 131.50 = 4
Flat fee is a one time cost. The hourly rate you have to multiply by the number of hours (6 in this case), and then add them.