-81.56% is the change from 900 to 166
Calculation steps:
[( 166 - 900 ) ÷ 900] x 100 = -81.56%
Formula
Percentage change = [(166 - 900) / 900] x 100
Subtract the new number by the original number
166 - 900 = -734
-734 ÷ 900 = -0.8155555555555556
-0.8155555555555556 x 100 = -81.56%