4900% is the change from 9 to 450
Calculation steps:
[( 450 - 9 ) ÷ 9] x 100 = 4900%
Formula
Percentage change = [(450 - 9) / 9] x 100
Subtract the new number by the original number
450 - 9 = 441
441 ÷ 9 = 49
49 x 100 = 4900%
Example