-24.78% is the change from 670 to 504
Calculation steps:
[( 504 - 670 ) ÷ 670] x 100 = -24.78%
Formula
Percentage change = [(504 - 670) / 670] x 100
Subtract the new number by the original number
504 - 670 = -166
-166 ÷ 670 = -0.24776119402985075
-0.24776119402985075 x 100 = -24.78%