59.23% is the change from 390 to 621
Calculation steps:
[( 621 - 390 ) ÷ 390] x 100 = 59.23%
Formula
Percentage change = [(621 - 390) / 390] x 100
Subtract the new number by the original number
621 - 390 = 231
231 ÷ 390 = 0.5923076923076923
0.5923076923076923 x 100 = 59.23%