12.78% is the change from 540 to 609
Calculation steps:
[( 609 - 540 ) ÷ 540] x 100 = 12.78%
Formula
Percentage change = [(609 - 540) / 540] x 100
Subtract the new number by the original number
609 - 540 = 69
69 ÷ 540 = 0.12777777777777777
0.12777777777777777 x 100 = 12.78%