-86.38% is the change from 800 to 109
Calculation steps:
[( 109 - 800 ) ÷ 800] x 100 = -86.38%
Formula
Percentage change = [(109 - 800) / 800] x 100
Subtract the new number by the original number
109 - 800 = -691
-691 ÷ 800 = -0.86375
-0.86375 x 100 = -86.38%