I started question 3 but my answer is not right. Need 4 done completely. thank you

Chapter 6 Homework Help Save & Exit Check my 3 Required information Use the following information for the Quick Study below. Trey Monson starts a merchandising business on December 1 and enters into the following three inventory Part 3 of 4 purchases. Also, on December 15, Monson sells 28 units for $50 each. 25 points Purchases on December18 units $20.00 eBook Hint Print Purchases on December 32 units 14 $30.00 cost Purchases on December 28 units $36.00 21 cost Qs 6-12 Perpetual: Inventory costing with weighted average LO P1