-81.42% is the change from 549 to 102
Calculation steps:
[( 102 - 549 ) ÷ 549] x 100 = -81.42%
Formula
Percentage change = [(102 - 549) / 549] x 100
Subtract the new number by the original number
102 - 549 = -447
-447 ÷ 549 = -0.8142076502732241
-0.8142076502732241 x 100 = -81.42%