-48.87% is the change from 665 to 340
Calculation steps:
[( 340 - 665 ) ÷ 665] x 100 = -48.87%
Formula
Percentage change = [(340 - 665) / 665] x 100
Subtract the new number by the original number
340 - 665 = -325
-325 ÷ 665 = -0.48872180451127817
-0.48872180451127817 x 100 = -48.87%