Sack Lunch

I used to eat rice ball in my first year in Aoyamagakuin University. However, now I bring my own suck lunch for my lunch. There are many advantages for making suck lunch. First, we can save money. My first year in Aoyamagakuin, I used 300 Yen everyday to buy 3 rice balls. This is total of 6000 yen per month. However, if we make our suck lunch, the cost is extremely low. In average, it only costs 15 yen to make one suck lunch. This means I'm saving 5400 yen per month for the lunch. And I can buy many things by 5400 yen. Many of my friends eats suck lunch and I enjoy eating with them.