-66.39% is the change from 833 to 280
Calculation steps:
[( 280 - 833 ) ÷ 833] x 100 = -66.39%
Formula
Percentage change = [(280 - 833) / 833] x 100
Subtract the new number by the original number
280 - 833 = -553
-553 ÷ 833 = -0.6638655462184874
-0.6638655462184874 x 100 = -66.39%
Example