50.77% is the change from 455 to 686
Calculation steps:
[( 686 - 455 ) ÷ 455] x 100 = 50.77%
Formula
Percentage change = [(686 - 455) / 455] x 100
Subtract the new number by the original number
686 - 455 = 231
231 ÷ 455 = 0.5076923076923077
0.5076923076923077 x 100 = 50.77%