Without offering advice, let's say you bought $85,000 worth of...

Without offering advice, let's say you bought $85,000 worth of shares, sold $67,000 worth, but were still holding $16,000 of those shares at cost (you could use market value as explained before). Your profit or loss would be: sales minus purchases plus closing stock (I assume you had no opening stock). Therefore in number terms $67,000 less $85,000 plus $16,000 = -$2,000. Therefore a $2,000 loss.

Cheers