-4.21% is the change from 285 to 273
Calculation steps:
[( 273 - 285 ) ÷ 285] x 100 = -4.21%
Formula
Percentage change = [(273 - 285) / 285] x 100
Subtract the new number by the original number
273 - 285 = -12
-12 ÷ 285 = -0.042105263157894736
-0.042105263157894736 x 100 = -4.21%