-91.53% is the change from 248 to 21
Calculation steps:
[( 21 - 248 ) ÷ 248] x 100 = -91.53%
Formula
Percentage change = [(21 - 248) / 248] x 100
Subtract the new number by the original number
21 - 248 = -227
-227 ÷ 248 = -0.9153225806451613
-0.9153225806451613 x 100 = -91.53%