38.16% is the change from 304 to 420
Calculation steps:
[( 420 - 304 ) ÷ 304] x 100 = 38.16%
Formula
Percentage change = [(420 - 304) / 304] x 100
Subtract the new number by the original number
420 - 304 = 116
116 ÷ 304 = 0.3815789473684211
0.3815789473684211 x 100 = 38.16%