I have no idea what the density of the box is, and no way to calculate it.
But the density of the stuff inside it is 80/40 = 2 grams per milliliter.
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1.12g/ml
Density = Mass/Volume so Volume = Mass/Density. Having said that, density is not measured in grams so it cannot be 0.789 grams. As a result, the question cannot be answered.
The mass/mass percentage is 9.09 % (with the underlined digits repeating)
Volume = Mass/Density = 45.6/10.5 = 4.34 millilitres.
10.1