-18.57% is the change from 280 to 228
Calculation steps:
[( 228 - 280 ) ÷ 280] x 100 = -18.57%
Formula
Percentage change = [(228 - 280) / 280] x 100
Subtract the new number by the original number
228 - 280 = -52
-52 ÷ 280 = -0.18571428571428572
-0.18571428571428572 x 100 = -18.57%