My elementary school had a little school supplies store in the school itself. I bought a 4-function calculator for math. Next week, they had an upgraded calcula

My elementary school had a little school supplies store in the school itself. I bought a 4-function calculator for math. Next week, they had an upgraded calculator which showed the inputted formula and supported more functions. The old calculator was gone from the store, but my parents wouldn't give me money to buy the new one. So I took the old calculator apart, disconnected a power wire so it didn't work, and brought it back to exchange for the new one. Sorry school!