-96.56% is the change from 320 to 11
Calculation steps:
[( 11 - 320 ) ÷ 320] x 100 = -96.56%
Formula
Percentage change = [(11 - 320) / 320] x 100
Subtract the new number by the original number
11 - 320 = -309
-309 ÷ 320 = -0.965625
-0.965625 x 100 = -96.56%