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How to calculate the number of units sold?
A rectangle has a perimeter with linear units, and a surface area with square units. It has no cubic units.
Measure the amount of water: by volume or mass or whatever. Measure the total amount in the same units. Divide the first by the second and then multiply by 100.
Density = Mass/Volume. Conversion between units will depend on what the two units are.
In square units of measurements