The following standards for variable overhead have been established for a company that makes only one product Standard hours per unit of output Standard variable overhead rate The following data pertain to operations for the last month: 4,4 hours $ 16.00 per hour Actual hours 3,100 hours Actual total variable overhead cost $ 124,990 Actual output 1,620 units Required: a. What is the variable overhead rate variance for the month? b. What is the variable overhead efficiency variance for the month? (Indicate the effect of each variance by selecting "P" for favorable, "U" for unfavorable, and "None" for no effect file, zero variance), input all amounts os positive values.) Variable overhead rato variance Vorlatte overhead officiency variante