-80.84% is the change from 668 to 128
Calculation steps:
[( 128 - 668 ) ÷ 668] x 100 = -80.84%
Formula
Percentage change = [(128 - 668) / 668] x 100
Subtract the new number by the original number
128 - 668 = -540
-540 ÷ 668 = -0.8083832335329342
-0.8083832335329342 x 100 = -80.84%