500% is the change from 140 to 840
Calculation steps:
[( 840 - 140 ) ÷ 140] x 100 = 500%
Formula
Percentage change = [(840 - 140) / 140] x 100
Subtract the new number by the original number
840 - 140 = 700
700 ÷ 140 = 5
5 x 100 = 500%
Example