-65% is the change from 820 to 287
Calculation steps:
[( 287 - 820 ) ÷ 820] x 100 = -65%
Formula
Percentage change = [(287 - 820) / 820] x 100
Subtract the new number by the original number
287 - 820 = -533
-533 ÷ 820 = -0.65
-0.65 x 100 = -65%
Example