-65.67% is the change from 670 to 230
Calculation steps:
[( 230 - 670 ) ÷ 670] x 100 = -65.67%
Formula
Percentage change = [(230 - 670) / 670] x 100
Subtract the new number by the original number
230 - 670 = -440
-440 ÷ 670 = -0.6567164179104478
-0.6567164179104478 x 100 = -65.67%