-99.63% is the change from 800 to 3
Calculation steps:
[( 3 - 800 ) ÷ 800] x 100 = -99.63%
Formula
Percentage change = [(3 - 800) / 800] x 100
Subtract the new number by the original number
3 - 800 = -797
-797 ÷ 800 = -0.99625
-0.99625 x 100 = -99.63%