67.97% is the change from 231 to 388
Calculation steps:
[( 388 - 231 ) ÷ 231] x 100 = 67.97%
Formula
Percentage change = [(388 - 231) / 231] x 100
Subtract the new number by the original number
388 - 231 = 157
157 ÷ 231 = 0.6796536796536796
0.6796536796536796 x 100 = 67.97%