-80.22% is the change from 642 to 127
Calculation steps:
[( 127 - 642 ) ÷ 642] x 100 = -80.22%
Formula
Percentage change = [(127 - 642) / 642] x 100
Subtract the new number by the original number
127 - 642 = -515
-515 ÷ 642 = -0.8021806853582555
-0.8021806853582555 x 100 = -80.22%