-61% is the change from 823 to 321
Calculation steps:
[( 321 - 823 ) ÷ 823] x 100 = -61%
Formula
Percentage change = [(321 - 823) / 823] x 100
Subtract the new number by the original number
321 - 823 = -502
-502 ÷ 823 = -0.6099635479951397
-0.6099635479951397 x 100 = -61%