Answer:
C.
Step-by-step explanation:
Marginal cost is the increase or decrease in the total cost of a business will incur by producing one more unit of a product or serving one more customer.
Marginal costing is a technique of costing fully oriented towards managerial decision making and control. Marginal costing being a technique can be used in conjunction with any method of cost ascertainment. It can be use in combination with other techniques such as budgeting and standard costing.
Marginal costing is helpful in determining the profitability of products, departments, processes and cost centers.
In this case, the additional cost to the restore is $200 for the materials.