-27.61% is the change from 670 to 485
Calculation steps:
[( 485 - 670 ) ÷ 670] x 100 = -27.61%
Formula
Percentage change = [(485 - 670) / 670] x 100
Subtract the new number by the original number
485 - 670 = -185
-185 ÷ 670 = -0.27611940298507465
-0.27611940298507465 x 100 = -27.61%