-87.5% is the change from 24 to 3
Calculation steps:
[( 3 - 24 ) ÷ 24] x 100 = -87.5%
Formula
Percentage change = [(3 - 24) / 24] x 100
Subtract the new number by the original number
3 - 24 = -21
-21 ÷ 24 = -0.875
-0.875 x 100 = -87.5%
Example