-90.41% is the change from 834 to 80
Calculation steps:
[( 80 - 834 ) ÷ 834] x 100 = -90.41%
Formula
Percentage change = [(80 - 834) / 834] x 100
Subtract the new number by the original number
80 - 834 = -754
-754 ÷ 834 = -0.9040767386091128
-0.9040767386091128 x 100 = -90.41%