-37.88% is the change from 800 to 497
Calculation steps:
[( 497 - 800 ) ÷ 800] x 100 = -37.88%
Formula
Percentage change = [(497 - 800) / 800] x 100
Subtract the new number by the original number
497 - 800 = -303
-303 ÷ 800 = -0.37875
-0.37875 x 100 = -37.88%