-48.93% is the change from 280 to 143
Calculation steps:
[( 143 - 280 ) ÷ 280] x 100 = -48.93%
Formula
Percentage change = [(143 - 280) / 280] x 100
Subtract the new number by the original number
143 - 280 = -137
-137 ÷ 280 = -0.48928571428571427
-0.48928571428571427 x 100 = -48.93%