-15.56% is the change from 270 to 228
Calculation steps:
[( 228 - 270 ) ÷ 270] x 100 = -15.56%
Formula
Percentage change = [(228 - 270) / 270] x 100
Subtract the new number by the original number
228 - 270 = -42
-42 ÷ 270 = -0.15555555555555556
-0.15555555555555556 x 100 = -15.56%