-39.37% is the change from 127 to 77
Calculation steps:
[( 77 - 127 ) ÷ 127] x 100 = -39.37%
Formula
Percentage change = [(77 - 127) / 127] x 100
Subtract the new number by the original number
77 - 127 = -50
-50 ÷ 127 = -0.3937007874015748
-0.3937007874015748 x 100 = -39.37%