-72.89% is the change from 509 to 138
Calculation steps:
[( 138 - 509 ) ÷ 509] x 100 = -72.89%
Formula
Percentage change = [(138 - 509) / 509] x 100
Subtract the new number by the original number
138 - 509 = -371
-371 ÷ 509 = -0.7288801571709234
-0.7288801571709234 x 100 = -72.89%