Solve the following using decision trees for supply chain management:

Walmart, a retail giant, needs to decide on the optimal inventory level for the upcoming season. Based on historical data and market analysis, there is a $60\%$ chance that demand will be $442($Billion USD$)$ and a $40\%$ chance that demand will be $421($Billion USD$)$ worth of goods and services. The ordering cost per unit is $$10,$ and the retail price per unit is $$20.$ For each unit of surplus inventory, Walmart can sell it for $$15.$ However, for each unit of unmet demand, there is a penalty cost of $$30.$ Walmart can choose between ordering $431($Billion USD$)$ or $421($Billion USD$)$ worth of goods and services. Which ordering strategy should Walmart choose to maximize its profit?