Material Requirement planning $[20$ points$]$:

The bill of materials $($BOM$)$ of parts$/$components for a company is given below. There is only one storage space for each type of components and BI is indicated in parentheses in the first column. Basically $A_x$ and $A_y$ are the same components used for parts A and $B$ with $BI=200.$ Determine the plan orders release $($POR or PREL$)$ for Part B$.$

$\backslash$table$[[$Parts $($BI$),$Periodic BOM: Planned Order Release $($POR$),,],[1,2,3,4,5,6,7,8,9,10,11,12$