-67.88% is the change from 800 to 257
Calculation steps:
[( 257 - 800 ) ÷ 800] x 100 = -67.88%
Formula
Percentage change = [(257 - 800) / 800] x 100
Subtract the new number by the original number
257 - 800 = -543
-543 ÷ 800 = -0.67875
-0.67875 x 100 = -67.88%