-61.23% is the change from 828 to 321
Calculation steps:
[( 321 - 828 ) ÷ 828] x 100 = -61.23%
Formula
Percentage change = [(321 - 828) / 828] x 100
Subtract the new number by the original number
321 - 828 = -507
-507 ÷ 828 = -0.6123188405797102
-0.6123188405797102 x 100 = -61.23%