-83.88% is the change from 645 to 104
Calculation steps:
[( 104 - 645 ) ÷ 645] x 100 = -83.88%
Formula
Percentage change = [(104 - 645) / 645] x 100
Subtract the new number by the original number
104 - 645 = -541
-541 ÷ 645 = -0.8387596899224806
-0.8387596899224806 x 100 = -83.88%