Merle Corporation applies manufacturing overhead to products on the basis of standard machine-hours. For the most recent month, the company based its budget on 4,000 machine-hours. Budgeted and actual overhead costs for the month appear below: The company actually worked 3,690 machine-hours during the month. The standard hours allowed for the actual output were 3,620 machine-hours for the month. What was the overall variable overhead efficiency variance for the month?

A.	$721 Unfavorable

B.	$467 Favorable

C.	$254 Unfavorable

D.	$880 Favorable