42.79% is the change from 638 to 911
Calculation steps:
[( 911 - 638 ) ÷ 638] x 100 = 42.79%
Formula
Percentage change = [(911 - 638) / 638] x 100
Subtract the new number by the original number
911 - 638 = 273
273 ÷ 638 = 0.4278996865203762
0.4278996865203762 x 100 = 42.79%