10.59% is the change from 321 to 355
Calculation steps:
[( 355 - 321 ) ÷ 321] x 100 = 10.59%
Formula
Percentage change = [(355 - 321) / 321] x 100
Subtract the new number by the original number
355 - 321 = 34
34 ÷ 321 = 0.1059190031152648
0.1059190031152648 x 100 = 10.59%