Tommie, Inc. manufactured 3,000 chairs during June. The following vanable overhead data pertain to June Budgeted variable overhead cost per units 12.00 Actual variable manufacturing overhead cost$33,600 Flexible-budget amount for variable manufacturing overhead$36,000 Variable manufacturing overhead efficiency variance$720 unfavorable What is the variable overhead flexible-budget variance? O $2,400 favorable $720 unfavorable O $3,120 favorable O $2,400 unfavorable Moving to the next question prevents changes to this