3425% is the change from 12 to 423
Calculation steps:
[( 423 - 12 ) ÷ 12] x 100 = 3425%
Formula
Percentage change = [(423 - 12) / 12] x 100
Subtract the new number by the original number
423 - 12 = 411
411 ÷ 12 = 34.25
34.25 x 100 = 3425%
Example