21.36% is the change from 309 to 375
Calculation steps:
[( 375 - 309 ) ÷ 309] x 100 = 21.36%
Formula
Percentage change = [(375 - 309) / 309] x 100
Subtract the new number by the original number
375 - 309 = 66
66 ÷ 309 = 0.21359223300970873
0.21359223300970873 x 100 = 21.36%