64.36% is the change from 390 to 641
Calculation steps:
[( 641 - 390 ) ÷ 390] x 100 = 64.36%
Formula
Percentage change = [(641 - 390) / 390] x 100
Subtract the new number by the original number
641 - 390 = 251
251 ÷ 390 = 0.6435897435897436
0.6435897435897436 x 100 = 64.36%