421.88% is the change from 128 to 668
Calculation steps:
[( 668 - 128 ) ÷ 128] x 100 = 421.88%
Formula
Percentage change = [(668 - 128) / 128] x 100
Subtract the new number by the original number
668 - 128 = 540
540 ÷ 128 = 4.21875
4.21875 x 100 = 421.88%