-50.74% is the change from 816 to 402
Calculation steps:
[( 402 - 816 ) ÷ 816] x 100 = -50.74%
Formula
Percentage change = [(402 - 816) / 816] x 100
Subtract the new number by the original number
402 - 816 = -414
-414 ÷ 816 = -0.5073529411764706
-0.5073529411764706 x 100 = -50.74%