I don't know. He's in college. If it is a private school, cooking by yourself will definitely be much cheaper than the canteen, because the canteen fee will definitely be higher with his 2% tuition. But if you are a good undergraduate or junior college, I will recommend you to eat in the canteen. The food in the canteen is actually not expensive, even cheaper than going out to eat. Because first of all, I don't know if there is a vegetable market around your school or if your school is closed. Secondly, it takes longer to cook by yourself, such as buying ingredients, washing vegetables and washing dishes by yourself. It takes more energy to take care of these things. Might as well go to the canteen. Although there may be many people in the canteen, it is more practical and convenient than cooking by yourself.