-72.1% is the change from 1000 to 279
Calculation steps:
[( 279 - 1000 ) ÷ 1000] x 100 = -72.1%
Formula
Percentage change = [(279 - 1000) / 1000] x 100
Subtract the new number by the original number
279 - 1000 = -721
-721 ÷ 1000 = -0.721
-0.721 x 100 = -72.1%