65.46% is the change from 388 to 642
Calculation steps:
[( 642 - 388 ) ÷ 388] x 100 = 65.46%
Formula
Percentage change = [(642 - 388) / 388] x 100
Subtract the new number by the original number
642 - 388 = 254
254 ÷ 388 = 0.654639175257732
0.654639175257732 x 100 = 65.46%