82.44% is the change from 450 to 821
Calculation steps:
[( 821 - 450 ) ÷ 450] x 100 = 82.44%
Formula
Percentage change = [(821 - 450) / 450] x 100
Subtract the new number by the original number
821 - 450 = 371
371 ÷ 450 = 0.8244444444444444
0.8244444444444444 x 100 = 82.44%