-77.65% is the change from 85 to 19
Calculation steps:
[( 19 - 85 ) ÷ 85] x 100 = -77.65%
Formula
Percentage change = [(19 - 85) / 85] x 100
Subtract the new number by the original number
19 - 85 = -66
-66 ÷ 85 = -0.7764705882352941
-0.7764705882352941 x 100 = -77.65%