-96.28% is the change from 646 to 24
Calculation steps:
[( 24 - 646 ) ÷ 646] x 100 = -96.28%
Formula
Percentage change = [(24 - 646) / 646] x 100
Subtract the new number by the original number
24 - 646 = -622
-622 ÷ 646 = -0.9628482972136223
-0.9628482972136223 x 100 = -96.28%