Please answer the questions and also provide proper explanation with formulas??

A rm expects to achieve the following level of sales, to have the following cost of goods sold, and to make the following purchases of raw materials for the first 4 months of the year. The opening balance of inventory at the beginning of January was $218. What is the budgeted closing balance of inventory at the end of April? Jan Sales 78 Cost of goods sold 47 Purchases of raw materials 58 A rm manufactures hard disk drives and sells them for $108 each. Each drive requires raw materials costing $19. The number of units sold and total wages bill (including fulltime and casual staff) for each of the last 6 months are as follows. Which of the following is the best estimate of the variable component of this semixed wages cost? 1531 1709 1619 1740 1560 1592 A rm manufactures hard disk drives and sells them for $108 each. Each drive requires raw materials costing $19. The number of units sold and total wages bill (including fulltime and casual staff) for each of the last 6 months are as follows. What is the break-even point in terms of the number of units per month? 1531 1709 1619 1740 1566l 1592