39.57% is the change from 278 to 388
Calculation steps:
[( 388 - 278 ) ÷ 278] x 100 = 39.57%
Formula
Percentage change = [(388 - 278) / 278] x 100
Subtract the new number by the original number
388 - 278 = 110
110 ÷ 278 = 0.39568345323741005
0.39568345323741005 x 100 = 39.57%