-96.57% is the change from 321 to 11
Calculation steps:
[( 11 - 321 ) ÷ 321] x 100 = -96.57%
Formula
Percentage change = [(11 - 321) / 321] x 100
Subtract the new number by the original number
11 - 321 = -310
-310 ÷ 321 = -0.9657320872274143
-0.9657320872274143 x 100 = -96.57%