-97.07% is the change from 820 to 24
Calculation steps:
[( 24 - 820 ) ÷ 820] x 100 = -97.07%
Formula
Percentage change = [(24 - 820) / 820] x 100
Subtract the new number by the original number
24 - 820 = -796
-796 ÷ 820 = -0.9707317073170731
-0.9707317073170731 x 100 = -97.07%