85.71% is the change from 455 to 845
Calculation steps:
[( 845 - 455 ) ÷ 455] x 100 = 85.71%
Formula
Percentage change = [(845 - 455) / 455] x 100
Subtract the new number by the original number
845 - 455 = 390
390 ÷ 455 = 0.8571428571428571
0.8571428571428571 x 100 = 85.71%