73.79% is the change from 309 to 537
Calculation steps:
[( 537 - 309 ) ÷ 309] x 100 = 73.79%
Formula
Percentage change = [(537 - 309) / 309] x 100
Subtract the new number by the original number
537 - 309 = 228
228 ÷ 309 = 0.7378640776699029
0.7378640776699029 x 100 = 73.79%