31.29% is the change from 668 to 877
Calculation steps:
[( 877 - 668 ) ÷ 668] x 100 = 31.29%
Formula
Percentage change = [(877 - 668) / 668] x 100
Subtract the new number by the original number
877 - 668 = 209
209 ÷ 668 = 0.312874251497006
0.312874251497006 x 100 = 31.29%