642.22% is the change from 90 to 668
Calculation steps:
[( 668 - 90 ) ÷ 90] x 100 = 642.22%
Formula
Percentage change = [(668 - 90) / 90] x 100
Subtract the new number by the original number
668 - 90 = 578
578 ÷ 90 = 6.4222222222222225
6.4222222222222225 x 100 = 642.22%