567.68% is the change from 99 to 661
Calculation steps:
[( 661 - 99 ) ÷ 99] x 100 = 567.68%
Formula
Percentage change = [(661 - 99) / 99] x 100
Subtract the new number by the original number
661 - 99 = 562
562 ÷ 99 = 5.6767676767676765
5.6767676767676765 x 100 = 567.68%