A snowboard manufacturer makes the end product, denoted as an item A, using multiple key components. The relationship and lead time between the snowboard (item A) and components are summarized in Table 1. Based on the historical data (see Table 2), the manufacturer aims to forecast the demand of the snowboard (item A) in week 8 before conducting its ordering decisions. There are 15 units of B item, and 130 units of E item stored in its inventory. In addition, 50 units of H item will be arrived in week 4. Table 1. The product information Components Lead Time (weeks) Components A 1 B(2), C(1) B 3 D(2), E(2) C 1 E(4), D(2) D 1 - E 1 H(3), K(1) H 1 - K 1 - Table 2. Historical Sales Data of the Item A Week Sales Quantity Week Sales Quantity 1 40 5 62 2 45 6 65 3 60 7 68 4 59 8