-40.28% is the change from 509 to 304
Calculation steps:
[( 304 - 509 ) ÷ 509] x 100 = -40.28%
Formula
Percentage change = [(304 - 509) / 509] x 100
Subtract the new number by the original number
304 - 509 = -205
-205 ÷ 509 = -0.4027504911591356
-0.4027504911591356 x 100 = -40.28%