-42.08% is the change from 587 to 340
Calculation steps:
[( 340 - 587 ) ÷ 587] x 100 = -42.08%
Formula
Percentage change = [(340 - 587) / 587] x 100
Subtract the new number by the original number
340 - 587 = -247
-247 ÷ 587 = -0.42078364565587734
-0.42078364565587734 x 100 = -42.08%