The 2015 operating budget is based on sales of 10000 units at $10 per table. Budgeted variable costs are $6 per unit, while fixed costs total $20000. actual sales of 12000 units at $12 each. Actual variable costs were $5 per unit and fixed costs totaled $15000. Flexible Variances of sales Select one: O a. 24000 F O b. 20000 U O c. 20000 F 0 d. 24000 U