Answer:
The monthly fixed manufacturing cost is $7500.
Step-by-step explanation:
Variable cost per unit = change in total cost / change in no of units
= 6900-5000/8000-4200
= 0.5 per unit
Fixed cost = Total manfacturing cost - variable cost at a 4200 level
= 5000 - (4200*0.5)
= 5000 - 2100
= $2900
If company produces 9200 units:
Total manfacturing costs = fixed costs + 9200*variable cost per unit
= 2900 + (9200*0.5)
= $7500
Therefore, The monthly fixed manufacturing cost is $7500.