421.74% is the change from 161 to 840
Calculation steps:
[( 840 - 161 ) ÷ 161] x 100 = 421.74%
Formula
Percentage change = [(840 - 161) / 161] x 100
Subtract the new number by the original number
840 - 161 = 679
679 ÷ 161 = 4.217391304347826
4.217391304347826 x 100 = 421.74%