39.97% is the change from 668 to 935
Calculation steps:
[( 935 - 668 ) ÷ 668] x 100 = 39.97%
Formula
Percentage change = [(935 - 668) / 668] x 100
Subtract the new number by the original number
935 - 668 = 267
267 ÷ 668 = 0.3997005988023952
0.3997005988023952 x 100 = 39.97%