-48.44% is the change from 128 to 66
Calculation steps:
[( 66 - 128 ) ÷ 128] x 100 = -48.44%
Formula
Percentage change = [(66 - 128) / 128] x 100
Subtract the new number by the original number
66 - 128 = -62
-62 ÷ 128 = -0.484375
-0.484375 x 100 = -48.44%