66.75% is the change from 388 to 647
Calculation steps:
[( 647 - 388 ) ÷ 388] x 100 = 66.75%
Formula
Percentage change = [(647 - 388) / 388] x 100
Subtract the new number by the original number
647 - 388 = 259
259 ÷ 388 = 0.6675257731958762
0.6675257731958762 x 100 = 66.75%