$4.$ Develop a lot$-$for$-$lot solution of component $\backslash ($ X $\backslash )$ for the given gross requirements. It is the beginning of week $1$ and there are currently $30$ units of component $\backslash ($ X $\backslash )$ in stock. Component $\backslash ($ X $\backslash )$ has a lead time of $2$ week. There are scheduled receipts planned for week $3$ and week $4$ of $20$ each.