-92.34% is the change from 509 to 39
Calculation steps:
[( 39 - 509 ) ÷ 509] x 100 = -92.34%
Formula
Percentage change = [(39 - 509) / 509] x 100
Subtract the new number by the original number
39 - 509 = -470
-470 ÷ 509 = -0.9233791748526523
-0.9233791748526523 x 100 = -92.34%