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You can solve this by taking 12/21 and multiplying by 100. So, 12/21 = .571 * 100 = 57.1%
21/2 = 250%
(12/5 x 100) - 100 = 140 percent. The percentage change between 5 and 12 is a 140 percent increase.
It is: (35-21)/35 times 100 = 40% decrease
50% = 0.50 = 1/21/2 of 12 = 6