97.1% is the change from 310 to 611
Calculation steps:
[( 611 - 310 ) ÷ 310] x 100 = 97.1%
Formula
Percentage change = [(611 - 310) / 310] x 100
Subtract the new number by the original number
611 - 310 = 301
301 ÷ 310 = 0.9709677419354839
0.9709677419354839 x 100 = 97.1%