28.14% is the change from 668 to 856
Calculation steps:
[( 856 - 668 ) ÷ 668] x 100 = 28.14%
Formula
Percentage change = [(856 - 668) / 668] x 100
Subtract the new number by the original number
856 - 668 = 188
188 ÷ 668 = 0.281437125748503
0.281437125748503 x 100 = 28.14%