323.29% is the change from 73 to 309
Calculation steps:
[( 309 - 73 ) ÷ 73] x 100 = 323.29%
Formula
Percentage change = [(309 - 73) / 73] x 100
Subtract the new number by the original number
309 - 73 = 236
236 ÷ 73 = 3.232876712328767
3.232876712328767 x 100 = 323.29%