80.97% is the change from 310 to 561
Calculation steps:
[( 561 - 310 ) ÷ 310] x 100 = 80.97%
Formula
Percentage change = [(561 - 310) / 310] x 100
Subtract the new number by the original number
561 - 310 = 251
251 ÷ 310 = 0.8096774193548387
0.8096774193548387 x 100 = 80.97%