42.41% is the change from 639 to 910
Calculation steps:
[( 910 - 639 ) ÷ 639] x 100 = 42.41%
Formula
Percentage change = [(910 - 639) / 639] x 100
Subtract the new number by the original number
910 - 639 = 271
271 ÷ 639 = 0.4241001564945227
0.4241001564945227 x 100 = 42.41%