688.24% is the change from 85 to 670
Calculation steps:
[( 670 - 85 ) ÷ 85] x 100 = 688.24%
Formula
Percentage change = [(670 - 85) / 85] x 100
Subtract the new number by the original number
670 - 85 = 585
585 ÷ 85 = 6.882352941176471
6.882352941176471 x 100 = 688.24%