please provide detailed explanation

1.1 Calculate the economic order quantity (EOQ) per annum. (5 marks) Economic order quantity Startrek Secondary School purchases 700 math's sets per annum. The cost of each math set is R80. Each set is sold for R100. The cost of placing a single order is R45. The holding cost is 11% of the unit purchase price. 1.2 Calculate the value of closing inventory using the Weighted average cost inventory valuation (5 marks) method Inventory valuation The following information concerning blankets appeared in the journal of Casio Traders for the month of September 2022: Date Details Units Cost per unit Opening inventory 20 R85 7 Purchases 23 R90 16 Purchases 33 R95 25 Purchases 18 R100 31 Sales for the month 69