-25% is the change from 24 to 18
Calculation steps:
[( 18 - 24 ) ÷ 24] x 100 = -25%
Formula
Percentage change = [(18 - 24) / 24] x 100
Subtract the new number by the original number
18 - 24 = -6
-6 ÷ 24 = -0.25
-0.25 x 100 = -25%
Example