39.9% is the change from 391 to 547
Calculation steps:
[( 547 - 391 ) ÷ 391] x 100 = 39.9%
Formula
Percentage change = [(547 - 391) / 391] x 100
Subtract the new number by the original number
547 - 391 = 156
156 ÷ 391 = 0.3989769820971867
0.3989769820971867 x 100 = 39.9%