102.3% is the change from 391 to 791
Calculation steps:
[( 791 - 391 ) ÷ 391] x 100 = 102.3%
Formula
Percentage change = [(791 - 391) / 391] x 100
Subtract the new number by the original number
791 - 391 = 400
400 ÷ 391 = 1.0230179028132993
1.0230179028132993 x 100 = 102.3%