17.1% is the change from 421 to 493
Calculation steps:
[( 493 - 421 ) ÷ 421] x 100 = 17.1%
Formula
Percentage change = [(493 - 421) / 421] x 100
Subtract the new number by the original number
493 - 421 = 72
72 ÷ 421 = 0.171021377672209
0.171021377672209 x 100 = 17.1%