Nitrogen.
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Nitrogen. To be specific it takes up 78% of air whilst Oxygen takes up 21%. The remaining percentage consists of various gases including carbon dioxide.
40
78%
(8 x 80) - (7 x 78) ie 640 - 546 = 94. Not particularly likely?
90% of 78 = 90% * 78 = 0.9 * 78 = 70.2