51.15% is the change from 391 to 591
Calculation steps:
[( 591 - 391 ) ÷ 391] x 100 = 51.15%
Formula
Percentage change = [(591 - 391) / 391] x 100
Subtract the new number by the original number
591 - 391 = 200
200 ÷ 391 = 0.5115089514066496
0.5115089514066496 x 100 = 51.15%