80.22% is the change from 455 to 820
Calculation steps:
[( 820 - 455 ) ÷ 455] x 100 = 80.22%
Formula
Percentage change = [(820 - 455) / 455] x 100
Subtract the new number by the original number
820 - 455 = 365
365 ÷ 455 = 0.8021978021978022
0.8021978021978022 x 100 = 80.22%