-20.49% is the change from 488 to 388
Calculation steps:
[( 388 - 488 ) ÷ 488] x 100 = -20.49%
Formula
Percentage change = [(388 - 488) / 488] x 100
Subtract the new number by the original number
388 - 488 = -100
-100 ÷ 488 = -0.20491803278688525
-0.20491803278688525 x 100 = -20.49%