657.65% is the change from 85 to 644
Calculation steps:
[( 644 - 85 ) ÷ 85] x 100 = 657.65%
Formula
Percentage change = [(644 - 85) / 85] x 100
Subtract the new number by the original number
644 - 85 = 559
559 ÷ 85 = 6.576470588235294
6.576470588235294 x 100 = 657.65%