Each unit of a is composed of one unit of b, two units of c, and one unit of d. c is composed of two units of d and three units of e. items a, c, d, and e have on-hand inventories of 20, 10, 20, and 15 units, respectively. item b has a scheduled receipt of 10 units in period 1, and c has a scheduled receipt of 50 units in period 1. lot-for-lot (l4l) is used for items a and b. item c requires a minimum lot size of 50 units. d and e are required to be purchased in multiples of 95 and 55, respectively. lead times are one period for items a, b, and c, and two periods for items d and e. the gross requirements for a are 30 in period 2, 30 in period 5, and 40 in period 8. note: to simplify data handling to include the receipt of orders that have actually been placed in previous periods, the following five-level scheme can be used. (a number of different techniques are used in practice, but the important issue is to keep track of what is on hand, what is expected to arrive, what is needed, and what size orders should be placed.) find the planned order releases for all items. (leave no cells blank - be certain to enter "0" wherever required.) period 1 2 3 4 5 6 7 8 item a oh = 20 lt = 1 ss = 0 q = l4l gross requirements scheduled receipts projected available balance net requirements planned order receipts planned order releases item b oh = 0 lt = 1 ss = 0 q = l4l gross requirements scheduled receipts projected available balance net requirements planned order receipts planned order releases item c oh = 10 lt = 1 ss = 0 q = 50 gross requirements scheduled receipts projected available balance net requirements planned order receipts planned order releases item d oh = 20 lt = 2 ss = 0 q = 95 gross requirements scheduled receipts projected available balance net requirements planned order receipts planned order releases item e oh = 15 lt = 2 ss = 0 q = 55 gross requirements scheduled receipts projected available balance net requirements planned order receipts planned order releases