West Life Group Ltd. Inventory Information For January 2020 Purchase January Ist Purchase January 15th Purchase January 25th Numbers of units 500 1,000 2,000 Price paid per unit $50 $60 $70 *** There were no units on hand at the beginning of January 2020. On January 31st, 2020, West Life Group sold 1,500 units of inventory at $100 each to customers. Calculate cost of goods sold using the weighted average method