-77.21% is the change from 509 to 116
Calculation steps:
[( 116 - 509 ) ÷ 509] x 100 = -77.21%
Formula
Percentage change = [(116 - 509) / 509] x 100
Subtract the new number by the original number
116 - 509 = -393
-393 ÷ 509 = -0.7721021611001965
-0.7721021611001965 x 100 = -77.21%