-19.92% is the change from 487 to 390
Calculation steps:
[( 390 - 487 ) ÷ 487] x 100 = -19.92%
Formula
Percentage change = [(390 - 487) / 487] x 100
Subtract the new number by the original number
390 - 487 = -97
-97 ÷ 487 = -0.19917864476386038
-0.19917864476386038 x 100 = -19.92%