-36.13% is the change from 800 to 511
Calculation steps:
[( 511 - 800 ) ÷ 800] x 100 = -36.13%
Formula
Percentage change = [(511 - 800) / 800] x 100
Subtract the new number by the original number
511 - 800 = -289
-289 ÷ 800 = -0.36125
-0.36125 x 100 = -36.13%