99.56% is the change from 451 to 900
Calculation steps:
[( 900 - 451 ) ÷ 451] x 100 = 99.56%
Formula
Percentage change = [(900 - 451) / 451] x 100
Subtract the new number by the original number
900 - 451 = 449
449 ÷ 451 = 0.9955654101995566
0.9955654101995566 x 100 = 99.56%