441.94% is the change from 155 to 840
Calculation steps:
[( 840 - 155 ) ÷ 155] x 100 = 441.94%
Formula
Percentage change = [(840 - 155) / 155] x 100
Subtract the new number by the original number
840 - 155 = 685
685 ÷ 155 = 4.419354838709677
4.419354838709677 x 100 = 441.94%