50.47% is the change from 640 to 963
Calculation steps:
[( 963 - 640 ) ÷ 640] x 100 = 50.47%
Formula
Percentage change = [(963 - 640) / 640] x 100
Subtract the new number by the original number
963 - 640 = 323
323 ÷ 640 = 0.5046875
0.5046875 x 100 = 50.47%