-37.63% is the change from 800 to 499
Calculation steps:
[( 499 - 800 ) ÷ 800] x 100 = -37.63%
Formula
Percentage change = [(499 - 800) / 800] x 100
Subtract the new number by the original number
499 - 800 = -301
-301 ÷ 800 = -0.37625
-0.37625 x 100 = -37.63%