-52.3% is the change from 587 to 280
Calculation steps:
[( 280 - 587 ) ÷ 587] x 100 = -52.3%
Formula
Percentage change = [(280 - 587) / 587] x 100
Subtract the new number by the original number
280 - 587 = -307
-307 ÷ 587 = -0.5229982964224872
-0.5229982964224872 x 100 = -52.3%