-2.4% is the change from 500 to 488
Calculation steps:
[( 488 - 500 ) ÷ 500] x 100 = -2.4%
Formula
Percentage change = [(488 - 500) / 500] x 100
Subtract the new number by the original number
488 - 500 = -12
-12 ÷ 500 = -0.024
-0.024 x 100 = -2.4%
Example