-78.34% is the change from 831 to 180
Calculation steps:
[( 180 - 831 ) ÷ 831] x 100 = -78.34%
Formula
Percentage change = [(180 - 831) / 831] x 100
Subtract the new number by the original number
180 - 831 = -651
-651 ÷ 831 = -0.7833935018050542
-0.7833935018050542 x 100 = -78.34%