-97.8% is the change from 864 to 19
Calculation steps:
[( 19 - 864 ) ÷ 864] x 100 = -97.8%
Formula
Percentage change = [(19 - 864) / 864] x 100
Subtract the new number by the original number
19 - 864 = -845
-845 ÷ 864 = -0.9780092592592593
-0.9780092592592593 x 100 = -97.8%