288% is the change from 100 to 388
Calculation steps:
[( 388 - 100 ) ÷ 100] x 100 = 288%
Formula
Percentage change = [(388 - 100) / 100] x 100
Subtract the new number by the original number
388 - 100 = 288
288 ÷ 100 = 2.88
2.88 x 100 = 288%
Example