The (partial) cost sheet for the single product manufactured at Vienna Company follows. Direct labor (6 hours @ $20) (6 hours e $2) (6 hours e $4) $120 Variable overhead 12 Fixed overhead 24 The master budget level of production is 60,000 direct-labor hours, which is also the production volume used to compute the fixed overhead application rate. Other information available for operations over the past accounting period include the following. $110,000 253,000 140,000 U 4,000 F Actual variable overhead incurred Actual fixed overhead incurred Direct labor efficiency variance Variable overhead price variance Required: a. What was the variable overhead efficiency variance? b. What was the fixed overhead price variance? c. What was the fixed overhead production volume variance? (For all requirements, indicate the effect of each variance by selecting "F" for favorable, or "U" for unfavorable. If there is no effect, do not select either option.) a. Variable overhead efficiency variance b. Fixed overhead price variance c. Fixed overhead production volume variance