-88.89% is the change from 729 to 81
Calculation steps:
[( 81 - 729 ) ÷ 729] x 100 = -88.89%
Formula
Percentage change = [(81 - 729) / 729] x 100
Subtract the new number by the original number
81 - 729 = -648
-648 ÷ 729 = -0.8888888888888888
-0.8888888888888888 x 100 = -88.89%