-97.63% is the change from 800 to 19
Calculation steps:
[( 19 - 800 ) ÷ 800] x 100 = -97.63%
Formula
Percentage change = [(19 - 800) / 800] x 100
Subtract the new number by the original number
19 - 800 = -781
-781 ÷ 800 = -0.97625
-0.97625 x 100 = -97.63%