-25.34% is the change from 671 to 501
Calculation steps:
[( 501 - 671 ) ÷ 671] x 100 = -25.34%
Formula
Percentage change = [(501 - 671) / 671] x 100
Subtract the new number by the original number
501 - 671 = -170
-170 ÷ 671 = -0.2533532041728763
-0.2533532041728763 x 100 = -25.34%