455.56% is the change from 81 to 450
Calculation steps:
[( 450 - 81 ) ÷ 81] x 100 = 455.56%
Formula
Percentage change = [(450 - 81) / 81] x 100
Subtract the new number by the original number
450 - 81 = 369
369 ÷ 81 = 4.555555555555555
4.555555555555555 x 100 = 455.56%