To find the fixed cost, we need add all costs that do not change with the number of haircuts. These are the salaries of the barbers and the manager bonus, the advertisement fees, rent and the magazines. We also have the standard part of the utility payment, the 170$. Those add up to:
6*1310+520+280+980+20+170=9830$. We also have regarding the variable costs:
The utilities variable part are included since they depend on haircuts, barber supplies and the base rate of each barber per haircut. Hence those are:
(5.90+0.38+0.27 per haircut)=6.55$ per haircut