-54.48% is the change from 670 to 305
Calculation steps:
[( 305 - 670 ) ÷ 670] x 100 = -54.48%
Formula
Percentage change = [(305 - 670) / 670] x 100
Subtract the new number by the original number
305 - 670 = -365
-365 ÷ 670 = -0.5447761194029851
-0.5447761194029851 x 100 = -54.48%