Please answer fully question, and show all the steps

15-25 Sales-mix and sales-quantity variances. Lofty Bread Ltd is a baking company that operates in Thailand. The company produces two types of breada full loaf and a mini loaf. A full loaf is 8 inches long and a mini loaf is 3 inches long. Each full loaf is sold for B50 and each mini loaf is sold for B30. Lofty's budget and actual figures for the last year were as follows: a Budget Actual 3,600 4.000 2,000 B240.000 3,980 B319.400 Number of valets: Full loafs Mini loafs Revenue Variable costs: Wages Baking materials Utilities B114.000 B122.000 B6,200 B 12,400 B 6.520 B 9.200 B143.600 B126,720 Contribution B113.280 B175.800 Fixed costs: Rent and rates B 36.800 B 36,800 Operating income B 76,480 B139.000 Note: The currency of Thailand is the Thai Baht and the currency symbol is B. The budgeted contribution to sales ratios for the two types of valet are 44.6% for full loafs and 55% for mini loafs. Using the data provided for full valets and mini loals, compute: Required 1. The total sales-mix contribution variance. 2. The total sales-quantity contribution variance 3. Briefly differentiate between sales-mix and sales-quantity variances