-69.33% is the change from 838 to 257
Calculation steps:
[( 257 - 838 ) ÷ 838] x 100 = -69.33%
Formula
Percentage change = [(257 - 838) / 838] x 100
Subtract the new number by the original number
257 - 838 = -581
-581 ÷ 838 = -0.6933174224343676
-0.6933174224343676 x 100 = -69.33%