The following table lists the components needed to assemble an end item, lead times, and quantities on hand.

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a$.$ If $20$ units of the end item are to be assembled, how many additional units of $E$ are needed? $($Hint$.$ You don't need to develop an

MRP plan to determine this.$)$

Additional units

b$.$ An order for the end item is scheduled to be shipped at the start of week $17.$ What is the latest week that the order can be started

and still be ready to ship on time? $($Hint$.$ You don't need to develop an MRP plan for this part either.$)$

The latest week