-79.78% is the change from 539 to 109
Calculation steps:
[( 109 - 539 ) ÷ 539] x 100 = -79.78%
Formula
Percentage change = [(109 - 539) / 539] x 100
Subtract the new number by the original number
109 - 539 = -430
-430 ÷ 539 = -0.7977736549165121
-0.7977736549165121 x 100 = -79.78%