The (partial) cost sheet for the single product manufactured at Vienna Company follows. Direct labor Variable overhead Fixed overhead (25 hours @ $25) (25 hours @ $2) (25 hours @ $4) $625 50 100 The master budget level of production is 98,000 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. Actual variable overhead incurred Actual fixed overhead incurred Direct labor efficiency variance Variable overhead price variance $148,000 408,800 178,000 U 46,000 F 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