16.63% is the change from 421 to 491
Calculation steps:
[( 491 - 421 ) ÷ 421] x 100 = 16.63%
Formula
Percentage change = [(491 - 421) / 421] x 100
Subtract the new number by the original number
491 - 421 = 70
70 ÷ 421 = 0.166270783847981
0.166270783847981 x 100 = 16.63%