7.42% is the change from 391 to 420
Calculation steps:
[( 420 - 391 ) ÷ 391] x 100 = 7.42%
Formula
Percentage change = [(420 - 391) / 391] x 100
Subtract the new number by the original number
420 - 391 = 29
29 ÷ 391 = 0.0741687979539642
0.0741687979539642 x 100 = 7.42%