50% is the change from 394 to 591
Calculation steps:
[( 591 - 394 ) ÷ 394] x 100 = 50%
Formula
Percentage change = [(591 - 394) / 394] x 100
Subtract the new number by the original number
591 - 394 = 197
197 ÷ 394 = 0.5
0.5 x 100 = 50%
Example