-50.86% is the change from 816 to 401
Calculation steps:
[( 401 - 816 ) ÷ 816] x 100 = -50.86%
Formula
Percentage change = [(401 - 816) / 816] x 100
Subtract the new number by the original number
401 - 816 = -415
-415 ÷ 816 = -0.508578431372549
-0.508578431372549 x 100 = -50.86%