-97.75% is the change from 800 to 18
Calculation steps:
[( 18 - 800 ) ÷ 800] x 100 = -97.75%
Formula
Percentage change = [(18 - 800) / 800] x 100
Subtract the new number by the original number
18 - 800 = -782
-782 ÷ 800 = -0.9775
-0.9775 x 100 = -97.75%