-35.59% is the change from 399 to 257
Calculation steps:
[( 257 - 399 ) ÷ 399] x 100 = -35.59%
Formula
Percentage change = [(257 - 399) / 399] x 100
Subtract the new number by the original number
257 - 399 = -142
-142 ÷ 399 = -0.3558897243107769
-0.3558897243107769 x 100 = -35.59%