664.44% is the change from 90 to 688
Calculation steps:
[( 688 - 90 ) ÷ 90] x 100 = 664.44%
Formula
Percentage change = [(688 - 90) / 90] x 100
Subtract the new number by the original number
688 - 90 = 598
598 ÷ 90 = 6.644444444444445
6.644444444444445 x 100 = 664.44%