-80.25% is the change from 648 to 128
Calculation steps:
[( 128 - 648 ) ÷ 648] x 100 = -80.25%
Formula
Percentage change = [(128 - 648) / 648] x 100
Subtract the new number by the original number
128 - 648 = -520
-520 ÷ 648 = -0.8024691358024691
-0.8024691358024691 x 100 = -80.25%