81.94% is the change from 310 to 564
Calculation steps:
[( 564 - 310 ) ÷ 310] x 100 = 81.94%
Formula
Percentage change = [(564 - 310) / 310] x 100
Subtract the new number by the original number
564 - 310 = 254
254 ÷ 310 = 0.8193548387096774
0.8193548387096774 x 100 = 81.94%