10.31% is the change from 291 to 321
Calculation steps:
[( 321 - 291 ) ÷ 291] x 100 = 10.31%
Formula
Percentage change = [(321 - 291) / 291] x 100
Subtract the new number by the original number
321 - 291 = 30
30 ÷ 291 = 0.10309278350515463
0.10309278350515463 x 100 = 10.31%