4.48% is the change from 402 to 420
Calculation steps:
[( 420 - 402 ) ÷ 402] x 100 = 4.48%
Formula
Percentage change = [(420 - 402) / 402] x 100
Subtract the new number by the original number
420 - 402 = 18
18 ÷ 402 = 0.04477611940298507
0.04477611940298507 x 100 = 4.48%