Mini-Exercise 15-5 (Algo) Variable overhead variances LO 15-4, 15-5, 156 Acme Company's production budget for August is 17,900 units and includes the following component unit costs: direct materials, $8.0; direct labor, $10.4; variable overhead, $6.0. Budgeted fixed overhead is $36,000. Actual production in August was 18,135 units. Actual unit component costs incurred during August include direct materials, $8.60; direct labor, $9.80; varlable overhead, $7.20. Actual fixed overhead was $37,900. The standard variable overhead rate per unit consists of $6.0 per machine hour and each unit is allowed a standard of 1 hour of machine time. During August, $130,572 of actual variable overhead cost was incurred for 20,088 machine hours. Required: Calculate the variable overhead spending variance and the variable overhead efficiency variance. Note: Do not round intermediate calculations, Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance)