-80.9% is the change from 890 to 170
Calculation steps:
[( 170 - 890 ) ÷ 890] x 100 = -80.9%
Formula
Percentage change = [(170 - 890) / 890] x 100
Subtract the new number by the original number
170 - 890 = -720
-720 ÷ 890 = -0.8089887640449438
-0.8089887640449438 x 100 = -80.9%