99.49% is the change from 391 to 780
Calculation steps:
[( 780 - 391 ) ÷ 391] x 100 = 99.49%
Formula
Percentage change = [(780 - 391) / 391] x 100
Subtract the new number by the original number
780 - 391 = 389
389 ÷ 391 = 0.9948849104859335
0.9948849104859335 x 100 = 99.49%