109.09% is the change from 99 to 207
Calculation steps:
[( 207 - 99 ) ÷ 99] x 100 = 109.09%
Formula
Percentage change = [(207 - 99) / 99] x 100
Subtract the new number by the original number
207 - 99 = 108
108 ÷ 99 = 1.0909090909090908
1.0909090909090908 x 100 = 109.09%