Answer:
Fixed costs can be classified as Direct Fixed Costs anc Common Fixed costs.
Direct Fixed costs are traceable to the product or divisions. It may some times be eliminated if the related product or division discontinue.
Common Fixed costs are those which cannot be traceable to the product or division and hence allocated to the product or division. These costs will continue even if the segment is discontinued.
In the given scenario, the salary of on-site supervisor and estimator is direct fixed costs as it is directly related to the divisions.
Thus, the common fixed expenses are as follows in the table attached: