-97.11% is the change from 830 to 24
Calculation steps:
[( 24 - 830 ) ÷ 830] x 100 = -97.11%
Formula
Percentage change = [(24 - 830) / 830] x 100
Subtract the new number by the original number
24 - 830 = -806
-806 ÷ 830 = -0.9710843373493976
-0.9710843373493976 x 100 = -97.11%