A-Zone Media sells two models of e-readers. The budgeted price per unit for the wireless model is $211 and the budgeted price per unit for the wireless and cellular model is $454. The master budget called for sales of 11,900 wireless models and 3,450 wireless and cellular models during the current year. Actual results showed sales of 9,400 wireless models, with a price of $295 per unit, and 5,050 wireless and cellular models, with a price of $780 per unit. The standard variable cost per unit is $99 for a wireless model and $255 for a wireless and cellular model. Required: a. Compute the activity variance for these data. (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.) Activity variance b. Compute the mix and quantity variance for these data. (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.) Mix variance Quantity variance