-45.19% is the change from 509 to 279
Calculation steps:
[( 279 - 509 ) ÷ 509] x 100 = -45.19%
Formula
Percentage change = [(279 - 509) / 509] x 100
Subtract the new number by the original number
279 - 509 = -230
-230 ÷ 509 = -0.4518664047151277
-0.4518664047151277 x 100 = -45.19%