-31.87% is the change from 800 to 545
Calculation steps:
[( 545 - 800 ) ÷ 800] x 100 = -31.87%
Formula
Percentage change = [(545 - 800) / 800] x 100
Subtract the new number by the original number
545 - 800 = -255
-255 ÷ 800 = -0.31875
-0.31875 x 100 = -31.87%