help me solve these with explanations for my study guide, so its easy for me to understand

Period 3 4 5 1 80 2 30 50 50 50 Item LS: MIN 50 LT: 2 Gross Requirements Scheduled Receipts Projected on Hand Net requirements Planned Order Receipts Planned Order Releases 60 100 9. What are the net requirements for Item A in period 3? 10. What is the planned order receipt for Item A in period 4? 11. What is the planned order release for Item A in period 2? 12. What is the projected on hand for Item A in period 5? Period 1 2 3 4 5 80 30 50 SO 60 60 Item B LS: MULT 30 LT: 2 Gross Requirements Scheduled Receipts Projected on Hand Net requirements Planned Order Receipts Planned Order Releases 100 13. What are the net requirements for Item B in period 3? 14. What is the planned order release for Item B in period 2? 15. What is the projected on hand for Item B in period 4? 16. What is the planned order receipt for Item B in period 5