17.22% is the change from 331 to 388
Calculation steps:
[( 388 - 331 ) ÷ 331] x 100 = 17.22%
Formula
Percentage change = [(388 - 331) / 331] x 100
Subtract the new number by the original number
388 - 331 = 57
57 ÷ 331 = 0.17220543806646527
0.17220543806646527 x 100 = 17.22%