-91.43% is the change from 280 to 24
Calculation steps:
[( 24 - 280 ) ÷ 280] x 100 = -91.43%
Formula
Percentage change = [(24 - 280) / 280] x 100
Subtract the new number by the original number
24 - 280 = -256
-256 ÷ 280 = -0.9142857142857143
-0.9142857142857143 x 100 = -91.43%