-98.63% is the change from 800 to 11
Calculation steps:
[( 11 - 800 ) ÷ 800] x 100 = -98.63%
Formula
Percentage change = [(11 - 800) / 800] x 100
Subtract the new number by the original number
11 - 800 = -789
-789 ÷ 800 = -0.98625
-0.98625 x 100 = -98.63%