3.95% is the change from 405 to 421
Calculation steps:
[( 421 - 405 ) ÷ 405] x 100 = 3.95%
Formula
Percentage change = [(421 - 405) / 405] x 100
Subtract the new number by the original number
421 - 405 = 16
16 ÷ 405 = 0.03950617283950617
0.03950617283950617 x 100 = 3.95%