Given the product tree, explode, offset, and

calculate gross and net requirements.

All lead times are $1$ week. Order policy is lot$-$for$-$

lot. The MPS calls for $150$ B$\text{'}$s in week $4$ and $75$

B$\text{'}$s in week $5.$ There is a scheduled receipt of $210$

E$\text{'}$s in week $1.$

There are $50$ D$\text{'}$s and $80$ F$\text{'}$s on$-$hand.