-84.57% is the change from 648 to 100
Calculation steps:
[( 100 - 648 ) ÷ 648] x 100 = -84.57%
Formula
Percentage change = [(100 - 648) / 648] x 100
Subtract the new number by the original number
100 - 648 = -548
-548 ÷ 648 = -0.845679012345679
-0.845679012345679 x 100 = -84.57%