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Earlier discussion
2 older comments kept for context.
Oluwaseun Adeyemi
volume of air in the soil = (350 + 500) - 800
= 850 - 800 = 50 cm3
% of air in the soil = (volume of air)/total volume x (100)/1 = (50)/800 x 100 = 6.25%
Ojewole Taiwo
14.28% is the correct answer