-13.4% is the change from 485 to 420
Calculation steps:
[( 420 - 485 ) ÷ 485] x 100 = -13.4%
Formula
Percentage change = [(420 - 485) / 485] x 100
Subtract the new number by the original number
420 - 485 = -65
-65 ÷ 485 = -0.13402061855670103
-0.13402061855670103 x 100 = -13.4%