$4.-$The operation in question was named PROCESS A$,$ the requirements according to its forecast were calculated with the moving average method and the following program is proposed: $1271$ units in week $1$; $1381$ units in week $2$; $1250$ units in week $3$;$1200$ units in week $4$; $1130$ units in week $5$; $1720$ units per week $6$; $1180$ units in week $7$; $1180$ units during week $8$; $1600$ units in week $9$ and $1400$ units in week $10.$ A$\text{'}$s beginning inventory is $1165$ units. The delivery time for this process A is $1$ week and it manages an inventory policy of FOQ, with a lot size of $100$ units each time, and it is intended to have a safety inventory of $100$ units per week.