-80.9% is the change from 89 to 17
Calculation steps:
[( 17 - 89 ) ÷ 89] x 100 = -80.9%
Formula
Percentage change = [(17 - 89) / 89] x 100
Subtract the new number by the original number
17 - 89 = -72
-72 ÷ 89 = -0.8089887640449438
-0.8089887640449438 x 100 = -80.9%