685.88% is the change from 85 to 668
Calculation steps:
[( 668 - 85 ) ÷ 85] x 100 = 685.88%
Formula
Percentage change = [(668 - 85) / 85] x 100
Subtract the new number by the original number
668 - 85 = 583
583 ÷ 85 = 6.858823529411764
6.858823529411764 x 100 = 685.88%