-36.75% is the change from 800 to 506
Calculation steps:
[( 506 - 800 ) ÷ 800] x 100 = -36.75%
Formula
Percentage change = [(506 - 800) / 800] x 100
Subtract the new number by the original number
506 - 800 = -294
-294 ÷ 800 = -0.3675
-0.3675 x 100 = -36.75%