47.81% is the change from 640 to 946
Calculation steps:
[( 946 - 640 ) ÷ 640] x 100 = 47.81%
Formula
Percentage change = [(946 - 640) / 640] x 100
Subtract the new number by the original number
946 - 640 = 306
306 ÷ 640 = 0.478125
0.478125 x 100 = 47.81%