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Anonymous
21 percent is 21% or 21/100.
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21
25000 = 250 x 100, so 21% = 250 x 21...
(7 percent of 21) - (4 percent of 21) = 0.63
(24/100) x 21 = 5.04
Typically, the air you breathe is comprised of 18 to 21 percent Oxygen.