-79.4% is the change from 529 to 109
Calculation steps:
[( 109 - 529 ) ÷ 529] x 100 = -79.4%
Formula
Percentage change = [(109 - 529) / 529] x 100
Subtract the new number by the original number
109 - 529 = -420
-420 ÷ 529 = -0.7939508506616257
-0.7939508506616257 x 100 = -79.4%