4.56% is the change from 307 to 321
Calculation steps:
[( 321 - 307 ) ÷ 307] x 100 = 4.56%
Formula
Percentage change = [(321 - 307) / 307] x 100
Subtract the new number by the original number
321 - 307 = 14
14 ÷ 307 = 0.04560260586319218
0.04560260586319218 x 100 = 4.56%