-84.96% is the change from 645 to 97
Calculation steps:
[( 97 - 645 ) ÷ 645] x 100 = -84.96%
Formula
Percentage change = [(97 - 645) / 645] x 100
Subtract the new number by the original number
97 - 645 = -548
-548 ÷ 645 = -0.8496124031007752
-0.8496124031007752 x 100 = -84.96%