-6.19% is the change from 485 to 455
Calculation steps:
[( 455 - 485 ) ÷ 485] x 100 = -6.19%
Formula
Percentage change = [(455 - 485) / 485] x 100
Subtract the new number by the original number
455 - 485 = -30
-30 ÷ 485 = -0.061855670103092786
-0.061855670103092786 x 100 = -6.19%