-80.13% is the change from 800 to 159
Calculation steps:
[( 159 - 800 ) ÷ 800] x 100 = -80.13%
Formula
Percentage change = [(159 - 800) / 800] x 100
Subtract the new number by the original number
159 - 800 = -641
-641 ÷ 800 = -0.80125
-0.80125 x 100 = -80.13%