63.2% is the change from 394 to 643
Calculation steps:
[( 643 - 394 ) ÷ 394] x 100 = 63.2%
Formula
Percentage change = [(643 - 394) / 394] x 100
Subtract the new number by the original number
643 - 394 = 249
249 ÷ 394 = 0.631979695431472
0.631979695431472 x 100 = 63.2%