4.07% is the change from 491 to 511
Calculation steps:
[( 511 - 491 ) ÷ 491] x 100 = 4.07%
Formula
Percentage change = [(511 - 491) / 491] x 100
Subtract the new number by the original number
511 - 491 = 20
20 ÷ 491 = 0.04073319755600815
0.04073319755600815 x 100 = 4.07%