28.57% is the change from 238 to 306
Calculation steps:
[( 306 - 238 ) ÷ 238] x 100 = 28.57%
Formula
Percentage change = [(306 - 238) / 238] x 100
Subtract the new number by the original number
306 - 238 = 68
68 ÷ 238 = 0.2857142857142857
0.2857142857142857 x 100 = 28.57%