Roberts Corporation manufactured $100,000$ buckets during February. The overhead cost$-$allocation base is $$5\mathrm{.}00$ per machine$-$hour. The following variable overhead data pertain to February: Actual Production was $100,000$ units, Actual Machine$-$hours was $9,800$ hours, Actual Variable overhead cost per machine$-$hour was $$5\mathrm{.}25$; Budgeted Production is $100,000$ units, Budgeted Machine$-$hours is $10,000$ hours, and Budgeted Variable overhead cost per machine$-$hour is $$5\mathrm{.}00.$ What is the variable overhead efficiency variance?

$$1,000$ favorable

$$1,450$ unfavorable

$$2,450$ unfavorable

None of these answers is correct.