12.45% is the change from 273 to 307
Calculation steps:
[( 307 - 273 ) ÷ 273] x 100 = 12.45%
Formula
Percentage change = [(307 - 273) / 273] x 100
Subtract the new number by the original number
307 - 273 = 34
34 ÷ 273 = 0.12454212454212454
0.12454212454212454 x 100 = 12.45%