-37.41% is the change from 671 to 420
Calculation steps:
[( 420 - 671 ) ÷ 671] x 100 = -37.41%
Formula
Percentage change = [(420 - 671) / 671] x 100
Subtract the new number by the original number
420 - 671 = -251
-251 ÷ 671 = -0.3740685543964232
-0.3740685543964232 x 100 = -37.41%