-66.13% is the change from 800 to 271
Calculation steps:
[( 271 - 800 ) ÷ 800] x 100 = -66.13%
Formula
Percentage change = [(271 - 800) / 800] x 100
Subtract the new number by the original number
271 - 800 = -529
-529 ÷ 800 = -0.66125
-0.66125 x 100 = -66.13%