please help me undertsnd this question. exaplain it like you are teaching it to a first grader. where youre getting every number and how to get it if its not given. The answer to this qustion is 2,423(if this is not ur answer its wrong, please try again)

The table above provides the aggregate plan of Remarkable 2 tablet produced by. is known that the firm uses a level plan with backorders. Given this information, what is the number in the cell with the question mark? (If needed, round your final answer to nearest whole number \begin{tabular}{|cc|} \hline inding & \\ inv.\# & Stockout \\ 0 & 423 \\ 0 & 1150 \\ 0 & 877 \\ 226 & 0 \\ 0 & 1 \\ \hline \end{tabular}