-78.38% is the change from 800 to 173
Calculation steps:
[( 173 - 800 ) ÷ 800] x 100 = -78.38%
Formula
Percentage change = [(173 - 800) / 800] x 100
Subtract the new number by the original number
173 - 800 = -627
-627 ÷ 800 = -0.78375
-0.78375 x 100 = -78.38%