12.15% is the change from 321 to 360
Calculation steps:
[( 360 - 321 ) ÷ 321] x 100 = 12.15%
Formula
Percentage change = [(360 - 321) / 321] x 100
Subtract the new number by the original number
360 - 321 = 39
39 ÷ 321 = 0.12149532710280374
0.12149532710280374 x 100 = 12.15%