-96.42% is the change from 671 to 24
Calculation steps:
[( 24 - 671 ) ÷ 671] x 100 = -96.42%
Formula
Percentage change = [(24 - 671) / 671] x 100
Subtract the new number by the original number
24 - 671 = -647
-647 ÷ 671 = -0.9642324888226528
-0.9642324888226528 x 100 = -96.42%