-19.71% is the change from 487 to 391
Calculation steps:
[( 391 - 487 ) ÷ 487] x 100 = -19.71%
Formula
Percentage change = [(391 - 487) / 487] x 100
Subtract the new number by the original number
391 - 487 = -96
-96 ÷ 487 = -0.1971252566735113
-0.1971252566735113 x 100 = -19.71%