18.59% is the change from 355 to 421
Calculation steps:
[( 421 - 355 ) ÷ 355] x 100 = 18.59%
Formula
Percentage change = [(421 - 355) / 355] x 100
Subtract the new number by the original number
421 - 355 = 66
66 ÷ 355 = 0.18591549295774648
0.18591549295774648 x 100 = 18.59%