-97.09% is the change from 721 to 21
Calculation steps:
[( 21 - 721 ) ÷ 721] x 100 = -97.09%
Formula
Percentage change = [(21 - 721) / 721] x 100
Subtract the new number by the original number
21 - 721 = -700
-700 ÷ 721 = -0.970873786407767
-0.970873786407767 x 100 = -97.09%