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.

	Sauvignon Blanc				Chardonnay				Riesling			Total
Budgeted selling price	$	9.40			$	10.60			$	7.50
Budgeted variable cost	$	6.60			$	7.80			$	5.50
Budgeted selling quantity		19,900				7,200				11,900			39,000
Actual selling price	$	9.30			$	9.65			$	7.45
Actual variable cost	$	6.35			$	8.00			$	5.15
Actual selling quantity		21,500				7,400				11,800			40,700

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.