40.15% is the change from 391 to 548
Calculation steps:
[( 548 - 391 ) ÷ 391] x 100 = 40.15%
Formula
Percentage change = [(548 - 391) / 391] x 100
Subtract the new number by the original number
548 - 391 = 157
157 ÷ 391 = 0.40153452685422
0.40153452685422 x 100 = 40.15%