-83.13% is the change from 800 to 135
Calculation steps:
[( 135 - 800 ) ÷ 800] x 100 = -83.13%
Formula
Percentage change = [(135 - 800) / 800] x 100
Subtract the new number by the original number
135 - 800 = -665
-665 ÷ 800 = -0.83125
-0.83125 x 100 = -83.13%