Mathematics · Inventory Valuation

Using the periodic weighted average cost method to value closing inventory, what is the value of the cost of sales for April based upon the following information? 1 Apr - Opening inventory 4 units at a cost of $4.00 per unit 12 Apr - Purchased 10 units at a cost of $5.00 per unit 15 Apr - Sold 6 units at a price of $8.00 per unit 17 Apr - Purchased 10 units at a cost of $6.00 per unit 25 Apr - Sold 8 units at a price of $8.50 per unit