-42.51% is the change from 487 to 280
Calculation steps:
[( 280 - 487 ) ÷ 487] x 100 = -42.51%
Formula
Percentage change = [(280 - 487) / 487] x 100
Subtract the new number by the original number
280 - 487 = -207
-207 ÷ 487 = -0.42505133470225875
-0.42505133470225875 x 100 = -42.51%