operations management question

Project Description:

1. given the following data:
period 1 2 3 4 5 6 7 8 9
gross requirements 70 30 90 30 80 20 90 60 80
the beginning inventory is 0 and there are no scheduled receipts. the order cost is $90 and the holding cost is $1 per part per period.
(a) what are the order costs, carrying costs, and totals cost over the 9 periods using the lot-for-lot size rule?
(b) what are the order costs, carrying costs, and totals cost over the 9 periods using the fixed order quantity rule with foq = 100?
(c) what are the order costs, carrying costs, and totals cost over the 9 periods using the period order quantity rule with poq = 3?
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