-25% is the change from 324 to 243
Calculation steps:
[( 243 - 324 ) ÷ 324] x 100 = -25%
Formula
Percentage change = [(243 - 324) / 324] x 100
Subtract the new number by the original number
243 - 324 = -81
-81 ÷ 324 = -0.25
-0.25 x 100 = -25%
Example