a$.$ Using the information given below, develop a complete MRP material plan. The product structure of product A is as follows: Product A $($End product, Lead time $=1)$ has two assemblies in it named B and C; $3$ nos. of B $($Lead time $=2)$ and $2$ nos. of C $($Lead time $=1)$ make product A$.$ The Gross requirements of item A are $200$ units for period $4$ and $250$ units for period $5.$

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b$.$ If the lead time for item A increases by $1$ week, and the lead time for item C also increases by $1$ week, what will the revised material plan look like? Are there any problems which need immediate attention?