123.53% is the change from 306 to 684
Calculation steps:
[( 684 - 306 ) ÷ 306] x 100 = 123.53%
Formula
Percentage change = [(684 - 306) / 306] x 100
Subtract the new number by the original number
684 - 306 = 378
378 ÷ 306 = 1.2352941176470589
1.2352941176470589 x 100 = 123.53%