Assume that the actual amount of one of company's variable expenses was $$45,198.$ The company's planned level of activity was $19,000$ machine$-$hours, and its actual level of activity was $18,600$ machine$-$hours. The spending variance for this particular expense was $$9,114$ favorable. The cost formula per machine$-$hour for this expense is:

Multiple Choice

$$1\mathrm{.}94.$

$$1\mathrm{.}90.$

$$286.$

$$2\mathrm{.}92$