Answer:
b. $127,200
Step-by-step explanation:
Both sales and variable cost are dependent on the number of units sold.
The sales less the variable cost gives the contribution margin. The contribution margin less the fixed cost gives the net operating income.
As such, the total fixed cost of the corporation not traceable to the individual divisions
= $168,500 + $48,800 - $90,100
= $127,200