82.22% is the change from 450 to 820
Calculation steps:
[( 820 - 450 ) ÷ 450] x 100 = 82.22%
Formula
Percentage change = [(820 - 450) / 450] x 100
Subtract the new number by the original number
820 - 450 = 370
370 ÷ 450 = 0.8222222222222222
0.8222222222222222 x 100 = 82.22%