In addition to the information for Acme Company in Mini-Exercises 15.1 and 15.2, the standard variable overhead rate per unit consists of $6 per machine hour and each unit is allowed a standard of 1 hour of machine time. During August, $115,940 of actual variable overhead cost was incurred for 18,700 machine hours.

Required:

Calculate the variable overhead spending variance and the variable overhead efficiency variance.