25% is the change from 668 to 835
Calculation steps:
[( 835 - 668 ) ÷ 668] x 100 = 25%
Formula
Percentage change = [(835 - 668) / 668] x 100
Subtract the new number by the original number
835 - 668 = 167
167 ÷ 668 = 0.25
0.25 x 100 = 25%
Example