77.78% is the change from 360 to 640
Calculation steps:
[( 640 - 360 ) ÷ 360] x 100 = 77.78%
Formula
Percentage change = [(640 - 360) / 360] x 100
Subtract the new number by the original number
640 - 360 = 280
280 ÷ 360 = 0.7777777777777778
0.7777777777777778 x 100 = 77.78%