The trade war has seriously affected the company's business. The company has set up a project team and developed a process optimization plan, hoping to save money and expenditure. The current process operation cost is 10 million per year. The project team drafted two optimization plans: Process A has a 40% chance of saving 1.5 million, but there is a 30% chance of increasing by 1 million. There is still a 30% chance of no impact. Product B has a 50% chance of saving 2 million, but there is a 20% chance of increasing costs by 3 million. There is still a 30% chance that revenue will remain the same. Which process makes the estimated cost the lowest 贸易战已经严重影响公司的业务，公司组建一支项目团队,开发流程优化方案,希望能节约资金支出应对，目前流程运营成本每年1000万。项目团队起草了两套优化方案： 流程A有40%的可能性节约150万,但有30%可能性增加100万.还有30%可能性无影响。 产品B有50%的可能性将节约200万,但有 20%可能性增加成本300万.还有30%的可能性收入将保持不变。 哪项流程使得预计成本最低？