-25.31% is the change from 320 to 239
Calculation steps:
[( 239 - 320 ) ÷ 320] x 100 = -25.31%
Formula
Percentage change = [(239 - 320) / 320] x 100
Subtract the new number by the original number
239 - 320 = -81
-81 ÷ 320 = -0.253125
-0.253125 x 100 = -25.31%