971.25% is the change from 80 to 857
Calculation steps:
[( 857 - 80 ) ÷ 80] x 100 = 971.25%
Formula
Percentage change = [(857 - 80) / 80] x 100
Subtract the new number by the original number
857 - 80 = 777
777 ÷ 80 = 9.7125
9.7125 x 100 = 971.25%
Example