what are the formulas used for each of the yellow sections on this?

REQUIRED: Determine the cost assigned to ending inventory and to cost of goods sold using LIFO. Each yellow cell must include a formula using cell references, EVEN IF THE FORMULA RESULTIS ZERO. \begin{tabular}{l} 19 \\ \\ 20 \\ 21 \\ 23 \\ 24 \\ 25 \\ \hline 27 \\ 28 \\ 29 \\ 30 \\ 32 \\ 33 \\ \hline \end{tabular} \begin{tabular}{|l|l|l|l|l|l|} \hline Ending Inventory - Perpetual LIFO: & UnitsinEndingInventory & Costperunit & = & InventoryBalance \\ \hline & & & \\ \hline \end{tabular}