982.5% is the change from 80 to 866
Calculation steps:
[( 866 - 80 ) ÷ 80] x 100 = 982.5%
Formula
Percentage change = [(866 - 80) / 80] x 100
Subtract the new number by the original number
866 - 80 = 786
786 ÷ 80 = 9.825
9.825 x 100 = 982.5%
Example