Will's Welded Widgets (www) makes its Q Model from components R, S, and T. Component Ris made from two units of component X and one unit of component Y. Component T is made from one unit of component V and three units of component z. Here is the product structure tree for the Q Model: 2 weeks 3 weeks R (2) 4 weeks S (1) 2 weeks (3) (2) 3 weeks (1) 2 weeks z (3) 2 weeks 3 weeks 67. Using the given information, calculate the replenishment lead time for the Q Model assuming that you have no beginning inventories. 68. Using the given information, calculate the gross requirements for each of the components if the company plans to build 100 of its Q Models. Assume that there are no beginning inventories. Product QR s T x Y v Z Gross Requirements ITTITTI 69. Using the given information, calculate the gross requirements for each of the components when the company plans to build 100 of its Q Models if you have these inventories: 150 units of component T and 200 units of component R. Product Q R S T Y V Z Gross Requirements 70. Using the given information and the beginning inventories from Problem 69, calculate the minimum replenishment time for the 100 Q Models