121.29% is the change from 310 to 686
Calculation steps:
[( 686 - 310 ) ÷ 310] x 100 = 121.29%
Formula
Percentage change = [(686 - 310) / 310] x 100
Subtract the new number by the original number
686 - 310 = 376
376 ÷ 310 = 1.2129032258064516
1.2129032258064516 x 100 = 121.29%