Lake Cellars produces and sells white wine. The following data concern the three varietals of white wine the company currently offers. Sales data for August are given as follows. Required: a. Compute the sales price variance for all three wines. b. Compute the activity variance for Lake Cellars for August. c. Compute the mix and quantity variances for Lake Cellars for August. Complete this question by entering your answers in the tabs below. b. Compute the activity variance for Lake Cellars for August. c. Compute the mix and quantity variances for Lake Cellars for August. (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. Enter your answers rounded to the nearest whole dollar.)