12.63% is the change from 285 to 321
Calculation steps:
[( 321 - 285 ) ÷ 285] x 100 = 12.63%
Formula
Percentage change = [(321 - 285) / 285] x 100
Subtract the new number by the original number
321 - 285 = 36
36 ÷ 285 = 0.12631578947368421
0.12631578947368421 x 100 = 12.63%