6. The management of Zeta Fire Alarms has calculated the following variances: Direct materials cost variance Direct materials efficiency variance Direct labor cost variancello de Direct labor efficiency variance Total variable overhead variance Total fixed overhead variance $9,000 U 36,000 F 15,000 F 13,500 U 8,500 F 3,000 F What us the total overhead variance of the company? What is the total variance for the company