-79.64% is the change from 845 to 172
Calculation steps:
[( 172 - 845 ) ÷ 845] x 100 = -79.64%
Formula
Percentage change = [(172 - 845) / 845] x 100
Subtract the new number by the original number
172 - 845 = -673
-673 ÷ 845 = -0.7964497041420119
-0.7964497041420119 x 100 = -79.64%