Biggby Coffee has an exclusive contract with a coffee retailer. Caffeinated and Decaffeinated Coffee are types brands of coffee that Biggby sells to the retailer. The following information is provided for the month of February: Actual Budget Caffeinated DecafCaffeinated Decaf Sales in 3800 3960 3,300 4,400 lbs. pounds lbs. lbs. Ibs Price per $3.10 $2.90 $2.00 $3.00 pound Variable cost per 1.20 2.40 1.00 1.50 pound Contribution $1.90 $0.50 $1.00 $1.50 margin Budgeted and actual fixed corporate-sustaining costs are $1,850 and $2,300, respectively. What is the activity variance for the fixed costs? $0 $4500 $4100 $1,8500