-50.25% is the change from 800 to 398
Calculation steps:
[( 398 - 800 ) ÷ 800] x 100 = -50.25%
Formula
Percentage change = [(398 - 800) / 800] x 100
Subtract the new number by the original number
398 - 800 = -402
-402 ÷ 800 = -0.5025
-0.5025 x 100 = -50.25%