Het 2 The standards for product G7SV specify 4.2 direct labor-hours per unit at $12.50 per direct labor-hour. Last month 1610 units of product G78V were produced using 6.790 direct labor-hours at a total direct labor wage cost of $78,220 Required: a. What was the labor rate variance for the month? b. What was the labor efficiency variance for the month? (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (e., zero variance). Input all amounts as positive values.) a. Labor rate variance b. Labor efficiency variance