-64.38% is the change from 800 to 285
Calculation steps:
[( 285 - 800 ) ÷ 800] x 100 = -64.38%
Formula
Percentage change = [(285 - 800) / 800] x 100
Subtract the new number by the original number
285 - 800 = -515
-515 ÷ 800 = -0.64375
-0.64375 x 100 = -64.38%