37.6% is the change from 391 to 538
Calculation steps:
[( 538 - 391 ) ÷ 391] x 100 = 37.6%
Formula
Percentage change = [(538 - 391) / 391] x 100
Subtract the new number by the original number
538 - 391 = 147
147 ÷ 391 = 0.37595907928388744
0.37595907928388744 x 100 = 37.6%