28.29% is the change from 668 to 857
Calculation steps:
[( 857 - 668 ) ÷ 668] x 100 = 28.29%
Formula
Percentage change = [(857 - 668) / 668] x 100
Subtract the new number by the original number
857 - 668 = 189
189 ÷ 668 = 0.28293413173652693
0.28293413173652693 x 100 = 28.29%