876.47% is the change from 85 to 830
Calculation steps:
[( 830 - 85 ) ÷ 85] x 100 = 876.47%
Formula
Percentage change = [(830 - 85) / 85] x 100
Subtract the new number by the original number
830 - 85 = 745
745 ÷ 85 = 8.764705882352942
8.764705882352942 x 100 = 876.47%