I Open a Supermarket in the Apocalypse

Yang Tian, ​​who was dying, was possessed by the system and saved his life. But this system is very strange. It actually requires him to sell things in such a cruel environment at the end of the world? Well, anyway, this is an additional condition for the system to save him. "Didi, please sell 100 kilograms of rice in 12 hours!" "What? 100 Kilograms of rice?" MMP, 100 kilograms of rice is equivalent to several million in the apocalypse, and he was actually asked to sell it for a few yuan per kilogram? Okay, just sell it! But who would have thought that the system would bring him tens of thousands more kilograms of rice? And it's not just rice, it has everything! God, this system is so crazy, isn't it? And with this heaven-defying system, how will Yang Tian start his cheating life in the apocalypse?