11 1 pts Porter Company uses standard costs for its manufacturing division. Standards specify 0.1 direct labor hours per unit of product. The allocation base for variable overhead costs is direct labor hours. At the beginning of the year, the static budget for variable overhead costs included the following data: Production volume 6,100 units Budgeted variable overhead costs $16,000 Budgeted direct labor hours (DLHr) 610 hours At the end of the year, actual data were as follows: Production volume 4,200 units Actual variable overhead costs $15,400 Actual direct labor hours (DLHr) 480 hours What is the variable overhead efficiency variance? (Round any intermediate calculations to the nearest cent, and your final answer to the nearest dollar.) O $1,925 U O $1,925 F O $1,574 F O $1,574 U C av