The demand for subassembly S is 90 units in week 7 . Each unit of S requires 1 unit of T and 1 unit of U. Each unt of T requires 1 unit of V,2 unas of W, and 2 units of X Finally, each unt of U requires 2 units of Y and 3 units of Z. One firm manufactures all tems. It takes 2 weeks to make S,1 week to make T,2 weeks to make U,2 weeks to make V,3 weeks to make W,1 week to make X. 2 weeks to make Y, and 2 weeks to make Z. Cick the icon to vicw the product structure and the time-ghased product structure. In addison to 90 units of S, thore is also a demand for 30 units of U, which is a component of S. The 30 units of U are needed for maintenance purposes. These units are needed in week 6 . Modify the gross material requirements pian to refect this change (type o it the input box is not used). More Info The time-phased product structure