-25.37% is the change from 670 to 500
Calculation steps:
[( 500 - 670 ) ÷ 670] x 100 = -25.37%
Formula
Percentage change = [(500 - 670) / 670] x 100
Subtract the new number by the original number
500 - 670 = -170
-170 ÷ 670 = -0.2537313432835821
-0.2537313432835821 x 100 = -25.37%