20.26% is the change from 538 to 647
Calculation steps:
[( 647 - 538 ) ÷ 538] x 100 = 20.26%
Formula
Percentage change = [(647 - 538) / 538] x 100
Subtract the new number by the original number
647 - 538 = 109
109 ÷ 538 = 0.20260223048327136
0.20260223048327136 x 100 = 20.26%