fast please.

A company had the following purchases during its first year of operations: Sales January April May Purchases 20 units at $7 30 units at $8 15 units at $14 The company uses the weighted average method to determine the cost of its inventory. a. What is the weighted average cost per unit in May (round to one decimal place if necessary)? b. What is the cost of goods sold in May? c. What is the cost of ending inventory in May