4.47% is the change from 403 to 421
Calculation steps:
[( 421 - 403 ) ÷ 403] x 100 = 4.47%
Formula
Percentage change = [(421 - 403) / 403] x 100
Subtract the new number by the original number
421 - 403 = 18
18 ÷ 403 = 0.04466501240694789
0.04466501240694789 x 100 = 4.47%