-97.12% is the change from 728 to 21
Calculation steps:
[( 21 - 728 ) ÷ 728] x 100 = -97.12%
Formula
Percentage change = [(21 - 728) / 728] x 100
Subtract the new number by the original number
21 - 728 = -707
-707 ÷ 728 = -0.9711538461538461
-0.9711538461538461 x 100 = -97.12%