-18.07% is the change from 487 to 399
Calculation steps:
[( 399 - 487 ) ÷ 487] x 100 = -18.07%
Formula
Percentage change = [(399 - 487) / 487] x 100
Subtract the new number by the original number
399 - 487 = -88
-88 ÷ 487 = -0.1806981519507187
-0.1806981519507187 x 100 = -18.07%