-78.68% is the change from 821 to 175
Calculation steps:
[( 175 - 821 ) ÷ 821] x 100 = -78.68%
Formula
Percentage change = [(175 - 821) / 821] x 100
Subtract the new number by the original number
175 - 821 = -646
-646 ÷ 821 = -0.7868453105968332
-0.7868453105968332 x 100 = -78.68%