-40% is the change from 455 to 273
Calculation steps:
[( 273 - 455 ) ÷ 455] x 100 = -40%
Formula
Percentage change = [(273 - 455) / 455] x 100
Subtract the new number by the original number
273 - 455 = -182
-182 ÷ 455 = -0.4
-0.4 x 100 = -40%
Example