10.31% is the change from 388 to 428
Calculation steps:
[( 428 - 388 ) ÷ 388] x 100 = 10.31%
Formula
Percentage change = [(428 - 388) / 388] x 100
Subtract the new number by the original number
428 - 388 = 40
40 ÷ 388 = 0.10309278350515463
0.10309278350515463 x 100 = 10.31%