-69% is the change from 900 to 279
Calculation steps:
[( 279 - 900 ) ÷ 900] x 100 = -69%
Formula
Percentage change = [(279 - 900) / 900] x 100
Subtract the new number by the original number
279 - 900 = -621
-621 ÷ 900 = -0.69
-0.69 x 100 = -69%
Example