-27.31% is the change from 670 to 487
Calculation steps:
[( 487 - 670 ) ÷ 670] x 100 = -27.31%
Formula
Percentage change = [(487 - 670) / 670] x 100
Subtract the new number by the original number
487 - 670 = -183
-183 ÷ 670 = -0.27313432835820894
-0.27313432835820894 x 100 = -27.31%