-84.88% is the change from 800 to 121
Calculation steps:
[( 121 - 800 ) ÷ 800] x 100 = -84.88%
Formula
Percentage change = [(121 - 800) / 800] x 100
Subtract the new number by the original number
121 - 800 = -679
-679 ÷ 800 = -0.84875
-0.84875 x 100 = -84.88%