Premium Co$.$ produces park benches. A customer has offered Premium Co$.$ $$700$ per unit for $100$ units. The normal selling price is $$850$ per bench. To fill the order, Chris would incur unit$-$level costs of $$500$ per unit and batch$-$level costs of $$15,000.$ Premium Co$.$ also incurred $$20,000$ of product$-$level costs to design the bench and $$200,000$ of facility$-$level costs. The differential cost associated with the special order is Blank$\_\_\_\_\_\_.$

Multiple choice question.

$$90,000$

$$65,000$

$$100,000$

$$50,000$