-37.5% is the change from 504 to 315
Calculation steps:
[( 315 - 504 ) ÷ 504] x 100 = -37.5%
Formula
Percentage change = [(315 - 504) / 504] x 100
Subtract the new number by the original number
315 - 504 = -189
-189 ÷ 504 = -0.375
-0.375 x 100 = -37.5%