-97.49% is the change from 838 to 21
Calculation steps:
[( 21 - 838 ) ÷ 838] x 100 = -97.49%
Formula
Percentage change = [(21 - 838) / 838] x 100
Subtract the new number by the original number
21 - 838 = -817
-817 ÷ 838 = -0.9749403341288783
-0.9749403341288783 x 100 = -97.49%