Material Requirements Planning$\_($MRP$).$

What number should be placed in the spot presently filled with the $x?$

$($Refer to Slides $34$ to $37$ in Chapter $03-$or$-$Pages $82$ through $88$ in the textbook$)$

$\backslash$table$[[$Finished Product B$,$JAN,FEB,MAR,APR$],[$Gross Requirements,$30,50,70,40],[$Schedule Receipts,,$100,,],[$Planned Delivery,,,$60,],[\backslash$table$[[$Projected on Hand$],[$Inventory$]],\backslash$table$[[$Beginning$],[$Inventory$],[=80$