652.94% is the change from 85 to 640
Calculation steps:
[( 640 - 85 ) ÷ 85] x 100 = 652.94%
Formula
Percentage change = [(640 - 85) / 85] x 100
Subtract the new number by the original number
640 - 85 = 555
555 ÷ 85 = 6.529411764705882
6.529411764705882 x 100 = 652.94%