-28.66% is the change from 670 to 478
Calculation steps:
[( 478 - 670 ) ÷ 670] x 100 = -28.66%
Formula
Percentage change = [(478 - 670) / 670] x 100
Subtract the new number by the original number
478 - 670 = -192
-192 ÷ 670 = -0.2865671641791045
-0.2865671641791045 x 100 = -28.66%