-0.38% is the change from 800 to 797
Calculation steps:
[( 797 - 800 ) ÷ 800] x 100 = -0.38%
Formula
Percentage change = [(797 - 800) / 800] x 100
Subtract the new number by the original number
797 - 800 = -3
-3 ÷ 800 = -0.00375
-0.00375 x 100 = -0.38%