-83.63% is the change from 800 to 131
Calculation steps:
[( 131 - 800 ) ÷ 800] x 100 = -83.63%
Formula
Percentage change = [(131 - 800) / 800] x 100
Subtract the new number by the original number
131 - 800 = -669
-669 ÷ 800 = -0.83625
-0.83625 x 100 = -83.63%