The management of Kartoush Enterprises is analyzing variable overhead variances for the fiscal period just ended. During the period, Kartoushs management used 5,000 hours of direct labor. It had budgeted to use 8,000 hours of direct labor. Hours of direct labor is the single overhead driver of variable overhead. Variable overhead consists of two items. Indirect labor was budgeted as $2.00 per hour of direct labor. Indirect materials was budgeted as $1.00 per hour of direct labor. Actual variable overhead was $30,000. Required: Calculate Kartoush's variable overhead efficiency variance.