617.78% is the change from 90 to 646
Calculation steps:
[( 646 - 90 ) ÷ 90] x 100 = 617.78%
Formula
Percentage change = [(646 - 90) / 90] x 100
Subtract the new number by the original number
646 - 90 = 556
556 ÷ 90 = 6.177777777777778
6.177777777777778 x 100 = 617.78%