-73.52% is the change from 321 to 85
Calculation steps:
[( 85 - 321 ) ÷ 321] x 100 = -73.52%
Formula
Percentage change = [(85 - 321) / 321] x 100
Subtract the new number by the original number
85 - 321 = -236
-236 ÷ 321 = -0.735202492211838
-0.735202492211838 x 100 = -73.52%