-91.79% is the change from 280 to 23
Calculation steps:
[( 23 - 280 ) ÷ 280] x 100 = -91.79%
Formula
Percentage change = [(23 - 280) / 280] x 100
Subtract the new number by the original number
23 - 280 = -257
-257 ÷ 280 = -0.9178571428571428
-0.9178571428571428 x 100 = -91.79%