conduct mrp (material requirements planning) under lot-size ordering with a lot size of 90 units for frames and 75 units for wood sections. each shutter consists of three slatted wood sections and two frames a firm that produces wood shutters has received two orders: one for 150 shutters (week 5) and one for 180 shutters (week 9) the wood sections are made by the firm, and fabrication takes 2 weeks the frames are ordered, and lead time is 1 week assembly of the shutters requires 1 week there is a scheduled receipt of 85 wood sections in (i.e., at the beginning of) week 1.