-84.73% is the change from 838 to 128
Calculation steps:
[( 128 - 838 ) ÷ 838] x 100 = -84.73%
Formula
Percentage change = [(128 - 838) / 838] x 100
Subtract the new number by the original number
128 - 838 = -710
-710 ÷ 838 = -0.847255369928401
-0.847255369928401 x 100 = -84.73%