What is the variable overhead efficieny variance?

Zanik Corporation manufackunod 130.000 buckets during February. The variable overhead cost-allocation base s 55.10 per machine - how. The following variable overhoed data pertain to February Production Machine-hous Variable overhold cost per machine-hour What is the variable overhead efficiency variance? Actual 130.000 units 9,700 hours $5.30 Dudgeted 130.000 units 9,000 hours $5.10 O A $3,570 unfavorable OB. $3,570 favorable OG $3,710 unfavorable OD 53.710 favorable