0.26% is the change from 390 to 391
Calculation steps:
[( 391 - 390 ) ÷ 390] x 100 = 0.26%
Formula
Percentage change = [(391 - 390) / 390] x 100
Subtract the new number by the original number
391 - 390 = 1
1 ÷ 390 = 0.002564102564102564
0.002564102564102564 x 100 = 0.26%