-14.81% is the change from 270 to 230
Calculation steps:
[( 230 - 270 ) ÷ 270] x 100 = -14.81%
Formula
Percentage change = [(230 - 270) / 270] x 100
Subtract the new number by the original number
230 - 270 = -40
-40 ÷ 270 = -0.14814814814814814
-0.14814814814814814 x 100 = -14.81%