Please help me answer this and explain it. Thank you!

Data table Fit Gym began May with merchandise inventory of 72 crates of vitamins that cost a total of $3,600. During the month, Fit Gym purchased and sold merchandise on account as follows: (Click the icon to view the transactions.) Read the requirements. transaction. Once all of the transactions have been entered into the perpetual record, calculate the quantity and total cost of merchandise inventory purchased, sold, and on hand at the end of the period. (Enter the oldest inventory layers first.)