-64% is the change from 800 to 288
Calculation steps:
[( 288 - 800 ) ÷ 800] x 100 = -64%
Formula
Percentage change = [(288 - 800) / 800] x 100
Subtract the new number by the original number
288 - 800 = -512
-512 ÷ 800 = -0.64
-0.64 x 100 = -64%
Example