-91.22% is the change from 831 to 73
Calculation steps:
[( 73 - 831 ) ÷ 831] x 100 = -91.22%
Formula
Percentage change = [(73 - 831) / 831] x 100
Subtract the new number by the original number
73 - 831 = -758
-758 ÷ 831 = -0.9121540312876053
-0.9121540312876053 x 100 = -91.22%