Henninger's Nursery sells a variety of plants. Henninger sells most of its plants to local landscapers in the community. These plants come in "flats" containing 12 plants each. In May of the current year, Henninger had expected to sell 900 flats of petunias but produced and sold 940 flats instead. The company expects each flat to require 25 minutes of labor at a cost of $.15 per minute. In addition, variable overhead is applied at a rate of $.05 per minute. Actual costs incurred during May for the production and sale of 940 flats was as follows: Direct labor $3, 416 (24, 400 minutes at $.14 per minute) Variable overhead $1, 200 Required: Compute each of the following variances. Indicate whether the variance is favorable (F) or unfavorable (U). Direct labor rate variance. Direct labor efficiency variance. Variable overhead spending variance. Variable overhead efficiency variance