60.65% is the change from 399 to 641
Calculation steps:
[( 641 - 399 ) ÷ 399] x 100 = 60.65%
Formula
Percentage change = [(641 - 399) / 399] x 100
Subtract the new number by the original number
641 - 399 = 242
242 ÷ 399 = 0.606516290726817
0.606516290726817 x 100 = 60.65%