-97.23% is the change from 830 to 23
Calculation steps:
[( 23 - 830 ) ÷ 830] x 100 = -97.23%
Formula
Percentage change = [(23 - 830) / 830] x 100
Subtract the new number by the original number
23 - 830 = -807
-807 ÷ 830 = -0.9722891566265061
-0.9722891566265061 x 100 = -97.23%