82.64% is the change from 455 to 831
Calculation steps:
[( 831 - 455 ) ÷ 455] x 100 = 82.64%
Formula
Percentage change = [(831 - 455) / 455] x 100
Subtract the new number by the original number
831 - 455 = 376
376 ÷ 455 = 0.8263736263736263
0.8263736263736263 x 100 = 82.64%