11.85% is the change from 287 to 321
Calculation steps:
[( 321 - 287 ) ÷ 287] x 100 = 11.85%
Formula
Percentage change = [(321 - 287) / 287] x 100
Subtract the new number by the original number
321 - 287 = 34
34 ÷ 287 = 0.11846689895470383
0.11846689895470383 x 100 = 11.85%