-96.91% is the change from 648 to 20
Calculation steps:
[( 20 - 648 ) ÷ 648] x 100 = -96.91%
Formula
Percentage change = [(20 - 648) / 648] x 100
Subtract the new number by the original number
20 - 648 = -628
-628 ÷ 648 = -0.9691358024691358
-0.9691358024691358 x 100 = -96.91%