-22% is the change from 800 to 624
Calculation steps:
[( 624 - 800 ) ÷ 800] x 100 = -22%
Formula
Percentage change = [(624 - 800) / 800] x 100
Subtract the new number by the original number
624 - 800 = -176
-176 ÷ 800 = -0.22
-0.22 x 100 = -22%
Example