-84.71% is the change from 837 to 128
Calculation steps:
[( 128 - 837 ) ÷ 837] x 100 = -84.71%
Formula
Percentage change = [(128 - 837) / 837] x 100
Subtract the new number by the original number
128 - 837 = -709
-709 ÷ 837 = -0.8470728793309439
-0.8470728793309439 x 100 = -84.71%