4600% is the change from 9 to 423
Calculation steps:
[( 423 - 9 ) ÷ 9] x 100 = 4600%
Formula
Percentage change = [(423 - 9) / 9] x 100
Subtract the new number by the original number
423 - 9 = 414
414 ÷ 9 = 46
46 x 100 = 4600%
Example