28.74% is the change from 501 to 645
Calculation steps:
[( 645 - 501 ) ÷ 501] x 100 = 28.74%
Formula
Percentage change = [(645 - 501) / 501] x 100
Subtract the new number by the original number
645 - 501 = 144
144 ÷ 501 = 0.2874251497005988
0.2874251497005988 x 100 = 28.74%