6 pts ona The following data has been provided by Company A Budget Quantity Cost per unit Actual Quantity Cost per unit Sales (units) 1,000 $20.00 21.00 1,050 Materials (kg) 2,500 $5.00 5.50 2.450 Labor (hours) 500 $10.00 9.50 550 a) Calculate the Sales, Materials, Labor and total variances, please show your workings (4 points) b) Listone advantage and one disadvantage of variance analysis (2 points) Edit View Insert Format Tools Table 12pt Paragraph 2