21.56% is the change from 501 to 609
Calculation steps:
[( 609 - 501 ) ÷ 501] x 100 = 21.56%
Formula
Percentage change = [(609 - 501) / 501] x 100
Subtract the new number by the original number
609 - 501 = 108
108 ÷ 501 = 0.2155688622754491
0.2155688622754491 x 100 = 21.56%