Assume that the cost formula for one of a company's variable expenses is $$4\mathrm{.}80$ per unit. The company's planned level of activity was $2,000$ units and its actual level of activity was $2,190$ units. The actual amount of this expense was $$10,800.$ The activity variance for this expense is:

Multiple Choice

$$912$ U$.$

$$712$ U$.$

$$112$ U$.$

$$112$ F$.$