-76.01% is the change from 321 to 77
Calculation steps:
[( 77 - 321 ) ÷ 321] x 100 = -76.01%
Formula
Percentage change = [(77 - 321) / 321] x 100
Subtract the new number by the original number
77 - 321 = -244
-244 ÷ 321 = -0.7601246105919003
-0.7601246105919003 x 100 = -76.01%