-67.92% is the change from 399 to 128
Calculation steps:
[( 128 - 399 ) ÷ 399] x 100 = -67.92%
Formula
Percentage change = [(128 - 399) / 399] x 100
Subtract the new number by the original number
128 - 399 = -271
-271 ÷ 399 = -0.6791979949874687
-0.6791979949874687 x 100 = -67.92%