596.97% is the change from 99 to 690
Calculation steps:
[( 690 - 99 ) ÷ 99] x 100 = 596.97%
Formula
Percentage change = [(690 - 99) / 99] x 100
Subtract the new number by the original number
690 - 99 = 591
591 ÷ 99 = 5.96969696969697
5.96969696969697 x 100 = 596.97%