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Anonymous
You can solve this by taking 12/21 and multiplying by 100. So, 12/21 = .571 * 100 = 57.1%
Wiki User
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12% of 21 is 2.52
21/2 = 250%
75% increase
50% = 0.50 = 1/21/2 of 12 = 6
(7 percent of 21) - (4 percent of 21) = 0.63
21 percent is 21% or 21/100.