What's the labor efficiency variance???

Becton Labs, Inc., produces various chemical compounds for industrial use. One compound, called Fludex, is prepared using an elaborate distilling process. The company has developed standard costs for one unit of Fludex, as follows: Standard Quantity or Hours Standard Price or Rate Standard Cost Direct materials 2.10 ounces $15.00 per ounce $31.50 Direct labor 0.80 hours $15.00 per hour 12.00 Variable manufacturing overhead 0.80 hours. $ 3.50 per hour 2.80 Total standard cost per unit $46.30 During November, the following activity was recorded related to the production of Fludex: a. Materials purchased, 10,500 ounces at a cost of $143,325. b. There was no beginning inventory of materials; however, at the end of the month, 3,050 ounces of material remained in ending inventory. c. The company employs 21 lab technicians to work on the production of Fludex. During November, they each worked an average of 160 hours at an average pay rate of $13.50 per hour. d. Variable manufacturing overhead is assigned to Fludex on the basis of direct labor-hours. Variable manufacturing overhead costs during November totaled $6,800. e. During November, the company produced 3,500 units of Fludex. Req 1A Req 1B Req 2A Req 2B Req 3 For direct labor, compute the rate and efficiency variances. (Indicate the effect of each variance by selecting "F" for favorable, "U" for unfavorable, and "None" for no effect (i.e., zero variance). Input all amounts as positive values.) Labor rate variance 5,040 F Labor efficiency variance 13,800 U