Please help me find the "least total cost method indicates ____ units should be ordered to cover the need...

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The MRP gross requirements for Item X are shown here for the next 10 weeks. Lead time for A is two weeks, and setup cost is $13. There is a carrying cost of $0.02 per unit per week. Beginning inventory is 65 units. 2 10 3 15 4 45 WEEK 5 6 10 32 7 110 8 24 9 42 Gross requirements 10 150 20 Use the least total cost lot-sizing method to determine when and for what quantity the first order should be released. units should be ordered to cover the needs for Least total cost method indicates that periods 4 through 10 4 through 7 4 through 9