-67.18% is the change from 390 to 128
Calculation steps:
[( 128 - 390 ) ÷ 390] x 100 = -67.18%
Formula
Percentage change = [(128 - 390) / 390] x 100
Subtract the new number by the original number
128 - 390 = -262
-262 ÷ 390 = -0.6717948717948717
-0.6717948717948717 x 100 = -67.18%