Can you solve this question.There is anwer in system but not manually.Can you explain it in an explanatory way?

2. A seller is planning to order trees in Christmas and he can do it as a single order. He buys each tree for 3$ and sells it for 8$. While ignoring the re-ordering cost, non-selled trees are sold as wood for 2$. Demand is given at below. Seller can only order with x10 quantity. According to the information, please find the order quantity which maximizes the profit. (20 points) Demand 10 20 30 40 50 Probability SS 40-SS 10 20 30 SS= Refers to the 2*last two digits of your student number. If this value is less than 25, accept SS=25. For example, if your student number is 202012512, SS is equal to 2*12=24. And this value is less than 25, so SS=25 for this