-4.25% is the change from 800 to 766
Calculation steps:
[( 766 - 800 ) ÷ 800] x 100 = -4.25%
Formula
Percentage change = [(766 - 800) / 800] x 100
Subtract the new number by the original number
766 - 800 = -34
-34 ÷ 800 = -0.0425
-0.0425 x 100 = -4.25%