I suggest you go to the local grain and oil wholesale market to find out the price first, and then go to other grain stores to find out the retail price, and basically know what the profit point is. If the grain and oil market price fluctuates greatly, the profit point is generally around 8-9% during the price increase period, and it is generally around 5% when the price drops rapidly. Grain and oil make money by quantity. If you want to make money from a single product, I suggest you don't make this thing.