Suppose that there is currently no stock on hand of any component. The demand for "Z" is 76 units in Week 3 and 53 units in Week 5 . All lead times are one week. Both B and D must be purchased in lots of 100 units. Currently, there is a scheduled receipt of 300 units of D in Week 1. What number goes in the cell indicated by an "X"? \begin{tabular}{|l|l|l|l|l|l|l|l|l|} \hline Master & Week & Beg.Inv. & 1 & 2 & 3 & 4 & 5 & 6 \\ \hline Schedule & Quantity & & & & 76 & & 53 & \\ \hline \end{tabular}