-3.13% is the change from 800 to 775
Calculation steps:
[( 775 - 800 ) ÷ 800] x 100 = -3.13%
Formula
Percentage change = [(775 - 800) / 800] x 100
Subtract the new number by the original number
775 - 800 = -25
-25 ÷ 800 = -0.03125
-0.03125 x 100 = -3.13%