Geometry
posted by Arshi .
A certain type of tile costs $50 per square meter.
If the actual tiles are square tiles with sides 20 cm,
How much does one tile cost?

20cm * 20cm * $50/m^2 * m^2/(100cm)^2
= 20*20*50/100*100 = $2 per tile
makes sense, since 20cm = 1/5 m, so there are 25 tiles/m^2
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