Refer to the following product structure tree. At the beginning of week 7, 100 units of P are to be assembled. Component S is ordered in lot sizes of 300 units, and one such order is scheduled to arrive at the beginning of week 3. The lead time for assembling Q from S and T is 1 week, and the lead time for S is 2 weeks. There are 60 units of Q and 30 units of S currently in stock. Given this information:

1. Prepare a material requirements plan for S.

2. Assume that in week 5 that the quantity of P needed in week 7 has been changed from 100 to 90. If all the planned order releases through week 4 have been executed, how many units of Q and S will be on hand at the end of week 7?

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R (2) Q (3) T (2) S (4) P.