Business & farm

Ahh, got it...ok now I need some help!  The first thing it asks is beginning/ending inventory, is this the value?  If so, let's say $6,000 beginning and $500 at the end.  Then it asks in the next page Cost of Purchases is again, $6,000  spent on the original inventory, but then it gives strange numbers for the deduction like total sales $9,600, COGS $11,500 and GP -$1,900.  I am so not understanding what and how this is figured!