42.57% is the change from 639 to 911
Calculation steps:
[( 911 - 639 ) ÷ 639] x 100 = 42.57%
Formula
Percentage change = [(911 - 639) / 639] x 100
Subtract the new number by the original number
911 - 639 = 272
272 ÷ 639 = 0.42566510172143973
0.42566510172143973 x 100 = 42.57%