Calculate the porosity of the soil sample?

Use the information below to answer this question.
In an experiment on soil porosity, the following results were obtained:
Volume of dry soil = 52cm³
Volume of water= 48cm³
Volume of soil and water=78cm³

A. 28.21%
B. 42.31%
C. 45.83%
D. 61.54%

Correct Answer:

Option A = 28.21%