9.48% is the change from 211 to 231
Calculation steps:
[( 231 - 211 ) ÷ 211] x 100 = 9.48%
Formula
Percentage change = [(231 - 211) / 211] x 100
Subtract the new number by the original number
231 - 211 = 20
20 ÷ 211 = 0.0947867298578199
0.0947867298578199 x 100 = 9.48%