400% is the change from 168 to 840
Calculation steps:
[( 840 - 168 ) ÷ 168] x 100 = 400%
Formula
Percentage change = [(840 - 168) / 168] x 100
Subtract the new number by the original number
840 - 168 = 672
672 ÷ 168 = 4
4 x 100 = 400%
Example