6.64% is the change from 301 to 321
Calculation steps:
[( 321 - 301 ) ÷ 301] x 100 = 6.64%
Formula
Percentage change = [(321 - 301) / 301] x 100
Subtract the new number by the original number
321 - 301 = 20
20 ÷ 301 = 0.0664451827242525
0.0664451827242525 x 100 = 6.64%