-93.75% is the change from 800 to 50
Calculation steps:
[( 50 - 800 ) ÷ 800] x 100 = -93.75%
Formula
Percentage change = [(50 - 800) / 800] x 100
Subtract the new number by the original number
50 - 800 = -750
-750 ÷ 800 = -0.9375
-0.9375 x 100 = -93.75%