The following data are available for the most recent year of operations for Slacker \& Sons. The revenue portion of the sales variance is $279,000F. 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 Slacker \& Sons. Complete this question by entering your answers in the tabs below. How many units were actually sold in the most recent period? (Do not round intermediate calculations.) Prepare a sales activity variance for the most recent year for Slacker \& Sons. (Do not round intermediate calculations. 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.)