4. (20 Marks) A company is using dependent inventory modeling. Hence, the demand for product C is 200 units and shall be supplied in eighth week. Each unit of C requires 1 unit of K and "2 unit of U. each unit of K requires 1 unit of V, 2 units of W, and 1 unit of X, Finally, each unit of U requires / unit of Y and 3 unit of Z. All items are manufactured by the same firm. It takes two weeks to make C, two weeks to make K, three weeks to make U, two weeks to make V, three weeks to make W, one week to make X, two weeks to make Y, and one week to make Z. Construct a material structure tree and formulate the net material requirements plan for the dependent inventory items using the following on hand inventory data. Items K U V W X Y z On hand inventory 15 10 15 20 15 10 15 20