40.47% is the change from 640 to 899
Calculation steps:
[( 899 - 640 ) ÷ 640] x 100 = 40.47%
Formula
Percentage change = [(899 - 640) / 640] x 100
Subtract the new number by the original number
899 - 640 = 259
259 ÷ 640 = 0.4046875
0.4046875 x 100 = 40.47%