-92.5% is the change from 320 to 24
Calculation steps:
[( 24 - 320 ) ÷ 320] x 100 = -92.5%
Formula
Percentage change = [(24 - 320) / 320] x 100
Subtract the new number by the original number
24 - 320 = -296
-296 ÷ 320 = -0.925
-0.925 x 100 = -92.5%
Example