-81% is the change from 321 to 61
Calculation steps:
[( 61 - 321 ) ÷ 321] x 100 = -81%
Formula
Percentage change = [(61 - 321) / 321] x 100
Subtract the new number by the original number
61 - 321 = -260
-260 ÷ 321 = -0.8099688473520249
-0.8099688473520249 x 100 = -81%