7.12% is the change from 393 to 421
Calculation steps:
[( 421 - 393 ) ÷ 393] x 100 = 7.12%
Formula
Percentage change = [(421 - 393) / 393] x 100
Subtract the new number by the original number
421 - 393 = 28
28 ÷ 393 = 0.07124681933842239
0.07124681933842239 x 100 = 7.12%