please explain how to get these answers

Use the information below to work the problems in this section. - Assume every month has four weeks - January demand is 200 - February demand is 300 - Beginning inventory is 54 - Lot size is 150 - Firm planned orders for the first six weeks are: 50,38,22,18,6, and 2 - The remaining two weeks do not have any firm orders Develop a master production schedule. \begin{tabular}{|c|c|c|c|c|c|c|c|c|} \hline & \multicolumn{4}{|c|}{ January } & \multicolumn{4}{|c|}{ February } \\ \hline & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\ \hline Forecast & 50 & 50 & 50 & 50 & 75 & 75 & 75 & 75 \\ \hline Customer orders & 50 & 38 & 22 & 18 & 6 & 2 & & \\ \hline Inventory before MPS & 4 & -46 & -96 & -146 & -221 & -296 & -371 & -446 \\ \hline MPS & & 150 & & & 150 & & 150 & \\ \hline Projected inventory & 4 & 104 & 54 & 4 & 79 & 4 & 79 & 4 \\ \hline ATP & 4 & 72 & & & 142 & & 150 & \\ \hline \end{tabular}