Blue Nile Corporation manufactures two types of vacuum cleaners, the SIGMA for commercial building use and the Heavy Duty for residences. Budgeted and actual operating data for the year 2022 were as follows: Static Budget Number sold SIGMA Heavy Duty Total 5,000 20,000 25,000 Contribution margin $1,500,000 $3,000,000 $4,500,000 Actual Results SIGMA Heavy Duty Total Number sold 4,000 28,000 32,000 Contribution margin $1,280,000 $3,920,000 $5,200,000 1. Compute the budgeted and actual contribution margin per unit for each product. 2. What is the total static-budget variance in terms of the contribution margin? 3. What is the total sales-volume variance in terms of the contribution margin?