Please explain how to get these answers. Use MRP

Use the information below to work the problems in this section and the next three sections. Read the instructions in each section that follows fully and carefully. - Each X is made of 2Y and 1Z - Each Y is made of 3A and B - Each Z is made of 5A and C - We will ignore scheduling B and C Inventory information is as follows: Gross requirements for periods 1-8 are: 600,700,600,700,600,700,600, and 700. \begin{tabular}{|l|r|r|r|r|r|r|r|r|r|} \hline \multicolumn{1}{|c|}{X} & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline Gross Requirements & & 600 & 700 & 600 & 700 & 600 & 700 & 600 & 700 \\ \hline Scheduled Receipts & & & & & & & & & \\ \hline Projected on Hand (Begin) & \multirow{2}{*}{800} & 800 & 200 & 700 & 100 & 600 & & 500 & 1,100 \\ \cline { 1 - 8 } Projected on Hand (End) & & 200 & 700 & 100 & 600 & & 500 & 1,100 & 400 \\ \hline Net Requirements & & & 500 & & 600 & & 700 & 100 & \\ \hline Planned Order Receipts & & & 1,200 & & 1,200 & & 1,200 & 1,200 & \\ \hline Planned Order Releases & & 1,200 & & 1,200 & & 1,200 & 1,200 & & \\ \hline \end{tabular}