72.82% is the change from 309 to 534
Calculation steps:
[( 534 - 309 ) ÷ 309] x 100 = 72.82%
Formula
Percentage change = [(534 - 309) / 309] x 100
Subtract the new number by the original number
534 - 309 = 225
225 ÷ 309 = 0.7281553398058253
0.7281553398058253 x 100 = 72.82%