-96.99% is the change from 830 to 25
Calculation steps:
[( 25 - 830 ) ÷ 830] x 100 = -96.99%
Formula
Percentage change = [(25 - 830) / 830] x 100
Subtract the new number by the original number
25 - 830 = -805
-805 ÷ 830 = -0.9698795180722891
-0.9698795180722891 x 100 = -96.99%