-50.06% is the change from 801 to 400
Calculation steps:
[( 400 - 801 ) ÷ 801] x 100 = -50.06%
Formula
Percentage change = [(400 - 801) / 801] x 100
Subtract the new number by the original number
400 - 801 = -401
-401 ÷ 801 = -0.5006242197253433
-0.5006242197253433 x 100 = -50.06%