77.1% is the change from 310 to 549
Calculation steps:
[( 549 - 310 ) ÷ 310] x 100 = 77.1%
Formula
Percentage change = [(549 - 310) / 310] x 100
Subtract the new number by the original number
549 - 310 = 239
239 ÷ 310 = 0.7709677419354839
0.7709677419354839 x 100 = 77.1%