40.85% is the change from 639 to 900
Calculation steps:
[( 900 - 639 ) ÷ 639] x 100 = 40.85%
Formula
Percentage change = [(900 - 639) / 639] x 100
Subtract the new number by the original number
900 - 639 = 261
261 ÷ 639 = 0.4084507042253521
0.4084507042253521 x 100 = 40.85%