Q. 80 units of end item x are needed at beginning of week 6, also another 30 units are needed at beginning of week 8. Prepare a material requirements plan for component d. d can only be ordered in whole cases (60 units per case). On case of d is automatically received every o r week, beginning in week 1. Also, there are 80 units of b also 50 units of d now on hand. Lead times for all items are a function of quality: one week for up to 100 units, two weeks for 101 to 200 units, and three weeks for 201 to 300 units also four weeks for 301 or more units.