615.56% is the change from 90 to 644
Calculation steps:
[( 644 - 90 ) ÷ 90] x 100 = 615.56%
Formula
Percentage change = [(644 - 90) / 90] x 100
Subtract the new number by the original number
644 - 90 = 554
554 ÷ 90 = 6.155555555555556
6.155555555555556 x 100 = 615.56%