The following data are available for the most recent year of operations for Prest Products. The revenue portion of the sales activity variance is $225,000 U. Master budget based on budgeted sales of 45,000 units: Revenue Materials Labor Variable manufacturing overhead and administrative costs Fixed manufacturing overhead and administrative costs Required: a. How many units were actually sold in the most recent period? b. Prepare a sales activity variance for the most recent year for Prest Products. $ 1,500,000 510,000 375,000 75,000 180,000 Prepare a sales activity variance for the most recent year for Prest Products. (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.) Prest Products Sales Activity Variance Flexible Budget Sales Activity Variance Master Budget Sales revenue Variable costs: Materials $ 1,725,200 $ 225,200 F $ 1,500,000 (586,568) (76,568) U (510,000) Direct labor (431,300) (56,300) U (375,000) Variable manufacturing and administrative (86,260) (11,250) U (75,000) Total variable costs $ (1,104,128) $ (144,128) U $ (960,000) Contribution margin $ 621,072 $ 81,072 F $ 540,000 Fixed costs Manufacturing overhead and administrative (180,000) (180,000) Total fixed costs $ (180,000) $ (180,000) Operating profits $ 441,072 $ 81,072 F $ 360,000