-38.69% is the change from 504 to 309
Calculation steps:
[( 309 - 504 ) ÷ 504] x 100 = -38.69%
Formula
Percentage change = [(309 - 504) / 504] x 100
Subtract the new number by the original number
309 - 504 = -195
-195 ÷ 504 = -0.3869047619047619
-0.3869047619047619 x 100 = -38.69%