26.72% is the change from 509 to 645
Calculation steps:
[( 645 - 509 ) ÷ 509] x 100 = 26.72%
Formula
Percentage change = [(645 - 509) / 509] x 100
Subtract the new number by the original number
645 - 509 = 136
136 ÷ 509 = 0.26719056974459726
0.26719056974459726 x 100 = 26.72%