-49.75% is the change from 800 to 402
Calculation steps:
[( 402 - 800 ) ÷ 800] x 100 = -49.75%
Formula
Percentage change = [(402 - 800) / 800] x 100
Subtract the new number by the original number
402 - 800 = -398
-398 ÷ 800 = -0.4975
-0.4975 x 100 = -49.75%