87.78% is the change from 450 to 845
Calculation steps:
[( 845 - 450 ) ÷ 450] x 100 = 87.78%
Formula
Percentage change = [(845 - 450) / 450] x 100
Subtract the new number by the original number
845 - 450 = 395
395 ÷ 450 = 0.8777777777777778
0.8777777777777778 x 100 = 87.78%