9.57% is the change from 491 to 538
Calculation steps:
[( 538 - 491 ) ÷ 491] x 100 = 9.57%
Formula
Percentage change = [(538 - 491) / 491] x 100
Subtract the new number by the original number
538 - 491 = 47
47 ÷ 491 = 0.09572301425661914
0.09572301425661914 x 100 = 9.57%