-81.79% is the change from 549 to 100
Calculation steps:
[( 100 - 549 ) ÷ 549] x 100 = -81.79%
Formula
Percentage change = [(100 - 549) / 549] x 100
Subtract the new number by the original number
100 - 549 = -449
-449 ÷ 549 = -0.8178506375227687
-0.8178506375227687 x 100 = -81.79%