49.3% is the change from 428 to 639
Calculation steps:
[( 639 - 428 ) ÷ 428] x 100 = 49.3%
Formula
Percentage change = [(639 - 428) / 428] x 100
Subtract the new number by the original number
639 - 428 = 211
211 ÷ 428 = 0.4929906542056075
0.4929906542056075 x 100 = 49.3%