56.25% is the change from 640 to 1000
Calculation steps:
[( 1000 - 640 ) ÷ 640] x 100 = 56.25%
Formula
Percentage change = [(1000 - 640) / 640] x 100
Subtract the new number by the original number
1000 - 640 = 360
360 ÷ 640 = 0.5625
0.5625 x 100 = 56.25%