8.18% is the change from 220 to 238
Calculation steps:
[( 238 - 220 ) ÷ 220] x 100 = 8.18%
Formula
Percentage change = [(238 - 220) / 220] x 100
Subtract the new number by the original number
238 - 220 = 18
18 ÷ 220 = 0.08181818181818182
0.08181818181818182 x 100 = 8.18%