-56.88% is the change from 800 to 345
Calculation steps:
[( 345 - 800 ) ÷ 800] x 100 = -56.88%
Formula
Percentage change = [(345 - 800) / 800] x 100
Subtract the new number by the original number
345 - 800 = -455
-455 ÷ 800 = -0.56875
-0.56875 x 100 = -56.88%