28.92% is the change from 249 to 321
Calculation steps:
[( 321 - 249 ) ÷ 249] x 100 = 28.92%
Formula
Percentage change = [(321 - 249) / 249] x 100
Subtract the new number by the original number
321 - 249 = 72
72 ÷ 249 = 0.2891566265060241
0.2891566265060241 x 100 = 28.92%