-22.38% is the change from 800 to 621
Calculation steps:
[( 621 - 800 ) ÷ 800] x 100 = -22.38%
Formula
Percentage change = [(621 - 800) / 800] x 100
Subtract the new number by the original number
621 - 800 = -179
-179 ÷ 800 = -0.22375
-0.22375 x 100 = -22.38%