-92.47% is the change from 279 to 21
Calculation steps:
[( 21 - 279 ) ÷ 279] x 100 = -92.47%
Formula
Percentage change = [(21 - 279) / 279] x 100
Subtract the new number by the original number
21 - 279 = -258
-258 ÷ 279 = -0.9247311827956989
-0.9247311827956989 x 100 = -92.47%