42.72% is the change from 639 to 912
Calculation steps:
[( 912 - 639 ) ÷ 639] x 100 = 42.72%
Formula
Percentage change = [(912 - 639) / 639] x 100
Subtract the new number by the original number
912 - 639 = 273
273 ÷ 639 = 0.4272300469483568
0.4272300469483568 x 100 = 42.72%