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It is 90,000 mm
The normal size of a ruler should be 12 inches or 30cm. (30 cm=300 mm) (1 in=25 mm)
30 mm = 0.098425 '
Guess 30 x 30 tile means a tile 30cm by 30cm i.e. approximately 1 foot by 1 foot, in which case the answer is 1 square foot.
30 cm = 11.811024 in