400 plus extra for breakage
178 tiles
Five tiles will cover 160 square feet so they will cover 100% of 156 square feet with a little excess. A precise coverage will require 4.875 tiles.
100 + 3%waste for cuts = 103.
6,144 tiles !
256 tiles
8 tiles
945
81
102
74.57
3
You would need 450 tiles