-88.77% is the change from 721 to 81
Calculation steps:
[( 81 - 721 ) ÷ 721] x 100 = -88.77%
Formula
Percentage change = [(81 - 721) / 721] x 100
Subtract the new number by the original number
81 - 721 = -640
-640 ÷ 721 = -0.8876560332871013
-0.8876560332871013 x 100 = -88.77%