So this route seems to be mathematically the best route I could come up with in the few hours I spent thinking. There might be a better route, but this route only requires five sales. I start by purchasing 10 Cups x3, 20 tsp of Coffee, 10 cups of Milk x5, and 10 tsp of Sugar x3. Then I set the Coffee to 4 tsp per Cup and start the day. Immediately after starting, set the price to $0.05, to ensure bankruptcy.