9.35% is the change from 321 to 351
Calculation steps:
[( 351 - 321 ) ÷ 321] x 100 = 9.35%
Formula
Percentage change = [(351 - 321) / 321] x 100
Subtract the new number by the original number
351 - 321 = 30
30 ÷ 321 = 0.09345794392523364
0.09345794392523364 x 100 = 9.35%