Assume that Product Z is made of two units of A and four units of B. A is made of three units of C and three of D. D is made of three units of E. Lead times for purchase or fabrication of each unit to final assembly are: Z takes two weeks; A, B, C, and D take one week each; and E takes three weeks. fifty units are required in Period 10. (Assume that there is currently no inventory on hand of any of these items.)
a) How many units of E are needed to make one unit of Z?
b) To have a completed Z, what is the lead time in weeks (for Z and all components)?