-16.63% is the change from 800 to 667
Calculation steps:
[( 667 - 800 ) ÷ 800] x 100 = -16.63%
Formula
Percentage change = [(667 - 800) / 800] x 100
Subtract the new number by the original number
667 - 800 = -133
-133 ÷ 800 = -0.16625
-0.16625 x 100 = -16.63%