851.76% is the change from 85 to 809
Calculation steps:
[( 809 - 85 ) ÷ 85] x 100 = 851.76%
Formula
Percentage change = [(809 - 85) / 85] x 100
Subtract the new number by the original number
809 - 85 = 724
724 ÷ 85 = 8.51764705882353
8.51764705882353 x 100 = 851.76%