-27.9% is the change from 1000 to 721
Calculation steps:
[( 721 - 1000 ) ÷ 1000] x 100 = -27.9%
Formula
Percentage change = [(721 - 1000) / 1000] x 100
Subtract the new number by the original number
721 - 1000 = -279
-279 ÷ 1000 = -0.279
-0.279 x 100 = -27.9%