7.93% is the change from 391 to 422
Calculation steps:
[( 422 - 391 ) ÷ 391] x 100 = 7.93%
Formula
Percentage change = [(422 - 391) / 391] x 100
Subtract the new number by the original number
422 - 391 = 31
31 ÷ 391 = 0.0792838874680307
0.0792838874680307 x 100 = 7.93%