-97.12% is the change from 729 to 21
Calculation steps:
[( 21 - 729 ) ÷ 729] x 100 = -97.12%
Formula
Percentage change = [(21 - 729) / 729] x 100
Subtract the new number by the original number
21 - 729 = -708
-708 ÷ 729 = -0.9711934156378601
-0.9711934156378601 x 100 = -97.12%