-88.31% is the change from 830 to 97
Calculation steps:
[( 97 - 830 ) ÷ 830] x 100 = -88.31%
Formula
Percentage change = [(97 - 830) / 830] x 100
Subtract the new number by the original number
97 - 830 = -733
-733 ÷ 830 = -0.8831325301204819
-0.8831325301204819 x 100 = -88.31%