A company sells two products: radios and speakers. The expected sales for radios were 1,500 units; 2,000 were sold. The budgeted selling price for radios was $15.00; however, the actual selling price was $13. The expected sales for speakers were 4,600 units; 5,000 were sold. The budgeted selling price for speakers was $7.50; however, the actual selling price was $9. Budgeted and actual variable costs were $4 per unit for the radios and $2 per unit for the speakers. What is the contribution margin sales volume variance for the period? a $7,700 unfavourable b. $7,700 favourable c. $2,200 favourable d. $2,200 unfavourable e $4,500 favourable