-96.25% is the change from 320 to 12
Calculation steps:
[( 12 - 320 ) ÷ 320] x 100 = -96.25%
Formula
Percentage change = [(12 - 320) / 320] x 100
Subtract the new number by the original number
12 - 320 = -308
-308 ÷ 320 = -0.9625
-0.9625 x 100 = -96.25%