-30% is the change from 670 to 469
Calculation steps:
[( 469 - 670 ) ÷ 670] x 100 = -30%
Formula
Percentage change = [(469 - 670) / 670] x 100
Subtract the new number by the original number
469 - 670 = -201
-201 ÷ 670 = -0.3
-0.3 x 100 = -30%
Example