Peter is tiling his bathroom shower. he will be tiling 3 walls on the shower and the fourth side will have a glass door. The shower measures 3 feet by 5 feet and the tiles will go 7 feet high. The glass door measures 5by7 feet. The tiles are 4 inches by 4 inches so there are 9 tilers per square foot it is recomended that he should purchase 10% more than the number of tiles to fill the srea in case any tiles break or need to be cut or replaced later