1.66% is the change from 421 to 428
Calculation steps:
[( 428 - 421 ) ÷ 421] x 100 = 1.66%
Formula
Percentage change = [(428 - 421) / 421] x 100
Subtract the new number by the original number
428 - 421 = 7
7 ÷ 421 = 0.0166270783847981
0.0166270783847981 x 100 = 1.66%