please thoroughly explain

You are negotiating terms with a supplier of a critical component in your manufacturing process. You receive 100 units monthly. You project needing 150 units for the next 6 months and perhaps as many as 200 units ongoing after that. Youve been satisfied with the suppliers quality, however there have been two occasions where late deliveries have forced overtime to meet customer commitments. An out of state vendor has offered you a 20% discount for the 200 units per month for a one year contract. Analyze the power factors, set up your negotiation strategy, walk through a scenario as to how you would approach your current supplier for a price reduction.

thank you inadvance