Deductions & credits

@RobertG 
@ThomasM125 

 

Now I have found something interesting and not sure about this one.  I am figuring up the "sale" price and such of the vehicle and I must be doing something odd or wrong.

 

Here are the numbers I am working with.  The payout for the vehicle, part used to pay off loan and the remained given to be to put on a newer vehicle was $20,221.81.  So I did this.  Took 20,221.81 x 7.71% and got 1559.1015.  Now I took that 1559.1015 and divided it by 2 which gives me 779.550.

 

But if I take the $20,221.81 and divide it in half, I get 10,110.905 then take amount times 3.855% (which is half of the 7.71%) and I actually get 389.775 for each person.  But if I take 10,110.905 and times it by 7.71% I get the 779.550 again.  

 

So my question would be do I use the 7.71% regardless of which value number I use, or should divide the % in half and use the half (3.855%) for myself and my wife?