-81.87% is the change from 491 to 89
Calculation steps:
[( 89 - 491 ) ÷ 491] x 100 = -81.87%
Formula
Percentage change = [(89 - 491) / 491] x 100
Subtract the new number by the original number
89 - 491 = -402
-402 ÷ 491 = -0.8187372708757638
-0.8187372708757638 x 100 = -81.87%