18.31% is the change from 355 to 420
Calculation steps:
[( 420 - 355 ) ÷ 355] x 100 = 18.31%
Formula
Percentage change = [(420 - 355) / 355] x 100
Subtract the new number by the original number
420 - 355 = 65
65 ÷ 355 = 0.18309859154929578
0.18309859154929578 x 100 = 18.31%