42.86% is the change from 217 to 310
Calculation steps:
[( 310 - 217 ) ÷ 217] x 100 = 42.86%
Formula
Percentage change = [(310 - 217) / 217] x 100
Subtract the new number by the original number
310 - 217 = 93
93 ÷ 217 = 0.42857142857142855
0.42857142857142855 x 100 = 42.86%